SEIKO 5K65 Diver’s Watch User Guide

SEIKO 5K65 Diver’s Watch

INSTRUCTION

Thank you very much for choosing a SEIKO watch. For proper and safe use of your SEIKO watch, please read carefully the instructions in this booklet before using it.
Keep this manual handy for easy reference.

• Length adjustment service for metallic bands is available at the retailer from whom the watch was purchased. If you cannot have your watch repaired by the retailer from whom the watch was purchased because you received the watch as a gift, or you moved to a distant place, please contact SEIKO CUSTOMER SERVICE CENTER. The service may also be available on a chargeable basis at other retailers, however, some retailers may not undertake the service.
• If your watch has a protective film for preventing scratches, make sure to peel it off before using the watch. If the watch is used with the film on it, dirt, sweat, dust, or moisture may be attached to the film and may cause rust.

WARNING: Make sure to read the following instructions before use and strictly observe them.

• When diving, never carry out operations other than those specified in this instruction manual. Mishandling of the product and misunderstanding of the displayed content may lead to a fatal or serious accident.
• The diver’s watch is an auxiliary instrument which mainly displays the passage of time and does not ensure the safety of a user. Use this watch while using the equipment (residual pressure gauge, water depth meter, etc.) required for safe diving.
• Never use this watch for “saturation diving” using helium gas.
• Do not dive using this product unless you have been properly trained in scuba diving, acquired the requisite experience and techniques for safe diving, thoroughly familiarized yourself with the operation and handling of this product, and inspect all functions of this product prior to each dive.

CAUTION: Make sure to read the following instructions before use and strictly observe them.Inspect the following items before diving (excluding saturation diving):

• The watch is operating normally.

• The remaining battery level is sufficient and the mainspring is sufficiently wound.

• The rotating bezel turns smoothly. (The bezel rotation must not be too loose or too tight.)

• Screws of the crown and other parts are reliably tightened.

• No abnormalities such as flaws or cracks exist on the band or glass.

• The band is reliably fixed (with spring bar, buckle or other parts.)
  If any abnormality is observed in the above items, do not use this watch for diving.

• Do not operate the crown or buttons underwater.

• As the use environment of the diver’s watch may affect not only the case or band but also the internal mechanism of the watch, we recommend that you periodically request an overhaul for inspection and adjustment approximately once every three to four years.

Handling cautions

WARNING: Please note that there is a risk of serious consequences such as severe injury if the following safety regulations are not strictly observed.

Immediately stop wearing the watch in following cases:

• ○ If the watch body or band becomes edged by corrosion etc.
• ○ If the pins protrude from the band.
  •  Immediately consult the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER.

Keep the watch and accessories out of the reach of babies and children.

• Care should be taken to prevent a baby or a child accidentally swallowing the accessories.
• If a baby or child swallows the battery or accessories, immediately consult a doctor, as it will be harmful to the health of the baby or child.

Do not remove the secondary battery from the watch.

• About the secondary battery → Power Source → P.33
• Replacement of the secondary battery requires professional knowledge and skill. Please ask the retailer from whom the watch was purchased for replacement of the secondary battery.
• Installation of an ordinary silver oxide battery can generate heat that can cause bursting and ignition.

CAUTION: Please note that there is a risk of minor injury or material damage if the following safety regulations are not strictly observed.
Avoid the following places for wearing or keeping the watch:

• Places where volatile agents (cosmetics such as polish remover, bug repellent, thinners etc.) are vaporizing
• Places where the temperature drops below 5°C or rises above 35°C for a long time
• Places affected by strong magnetism or static electricity
• Places affected by strong vibrations
• Places of high humidity
• Dusty places
  If you observe any allergic symptoms or skin irritation
  Stop wearing the watch immediately and consult a specialist such as a dermatologist or an allergist.

Other cautions

• For adjusting the length of the metallic band, specialized knowledge and expertise are necessary.
  Therefore, in such a case, contact the retailer from whom the watch was purchased. If you attempt to adjust the metallic band, injury may occur to your hand or fingers, or parts of the band may be lost.

• Do not disassemble or tamper with the watch.

• Please follow local government directions when disposing of the watch body and secondary battery.

• Keep the watch out of the reach of babies and children. Extra care should be taken to avoid risks of any injury or allergic rash or itching that may be caused when you touch the watch.

• If your watch is of the fob or pendant type, the strap or chain attached to the watch may damage your clothes, or injure the hand, neck, or other parts of your body.

WARNING

• Never use the watch, in saturation diving using helium gas.
• While diving, never operate the watch in any other manner than set forth in the instruction manual.
• Before using the diver’s watch, you have to be properly trained in various types of diving and possess the requisite experience and skill to dive safely. When diving, strictly abide by the rules of diving.

CAUTION
Please note that there is a risk of minor injury or material damage if the following safety regulations are not strictly observed.

Do not turn or pull out the crown when the watch is wet.
Water may get inside of the watch.
If the inner surface of the glass is clouded with condensation or water droplets appear inside of the watch for a long time, the water resistant performance of the watch is deteriorated. Immediately consult the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER.

Do not leave moisture, sweat and dirt on the watch for a long time.
Be aware of a risk that a water resistant watch may lessen its water resistant performance because of deterioration of the adhesive on the glass or gasket, or the development of rust on stainless steel.

Do not wear the watch while taking a bath or a sauna.
Steam, soap or some components of a hot spring may accelerate the deterioration of water resistant performance of the watch.

Precautions for diving (Please make sure to observe the following)

Before diving

Before diving, check the following:
“Names of the parts and their functions” → P.16

1. The time is correctly set.

2. The seconds hand is moving at one-second intervals.
   If the hand is moving at twosecond intervals or it is stopped, place the dial under light to charge the battery. * “Charging the battery” → P.30

3. The rotating bezel turns smoothly.
   (The bezel rotation must not be too loose or too tight.)
   “How to use the rotating bezel” → P.28

4. The crown is completely screwed in. “Screw down crown” → P.17

5. There are no visible cracks or scratches on the crystal or watch band.

6. The band is firmly attached to the watch (with spring bars, clamp or other parts.)

CAUTION: If there are any malfunctions, contact the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER.

While diving
Please observe the following cautions for use

• The watch can be used for air diving within the water resistant range displayed on the dial.
• Do not operate the crown or buttons underwater.
• Take care not to bump the watch against hard objects such as rocks.
• Bezel rotation may become slightly harder in the water but this is not a malfunction.

Structure of the case

• In the following types of models, take care of the following issues in usage.
• The bezel or protective outer case is securely fastened to the watch with setscrews.
• Never loosen the setscrews.

The above illustration is provided as an example, therefore it may not be exactly the same as your watch

CAUTION

• Never loosen the setscrews used to fix the bezel or protective outer case.
• Doing so may cause damage or result in further loosening.
  • If you find that the setscrews have become loose or are functioning abnormally, consult the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER.

After diving
Please follow the care instructions below after diving

Rinse the watch in fresh water to wash out all seawater and wipe it thoroughly dry to prevent rust. Avoid pouring running water onto the watch directly from a faucet. Put some water into a bowl first, and then soak the watch in the water to wash it.

CAUTION: Depending on the environment where a diver’s watch is used, its inner parts or movementas well as its case or band may be affected. We recommend that you have your watchoverhauled regularly once every 3 or 4 years.

Characteristics

Water-resistant performance for air diving… This watch is equipped with water resistant performance to be used in water for a long period of time with scuba diving tanks. (It cannot be used for saturation diving that uses helium gas.)

Time difference adjustment function: → P.24 When you move to a location with a different time zone, you can easily set the watch to indicate the local time.

GMT function: The watch can display time in two different time zones by indicating two different times with the hour hand and 24-hour hand.“Indicating the time of two different regions (As a dual time indicator)” → P.23

Solar charging function: The watch operates while charging electricity by converting light received on a solar cell placed beneath the dial to electrical energy. It cannot properly operate unless the remaining energy is sufficient. Place or store the watch in a location receiving light etc., to sufficiently charge electricity.

• “How to charge the battery” → P.30
• “Guide to charging times” → P.31
• “Power Source” → P.33

Names of the parts and their functions

1. Minute hand
2. Hour hand
3. Seconds hand
4. 24-hour hand
5. Date
6. Crown
7. Rotating bezel
   “How to use the rotating bezel” → P.28

The position and design of the display may vary depending on the model.

Screw down crown

The screw down crown features a mechanism that can securely lock the crown when it is not being operated in order to prevent any operational errors and to improve its water resistant performance.

• It is necessary to unlock the screw down crown before operating it.
• Once you have finished operating the crown, make sure to relock it.

[To unlock the crown]

• Turn the crown counterclockwise to unscrew it.
• Now the crown can be operated.

[To lock the crown]

• Turn the crown clockwise while gently pressing it in toward the watch body until it stops.

When locking the crown, turn it slowly with care, ensuring that the screw is properly engaged. Be careful not to push it in forcefully, as doing so may damage the screw hole in the case.

How to set the time and date

• To set both time and date, set the 24-hour hand and minute hand first, and then set the date and the hour hand.
• To adjust the date only on a day such as the next day after the completion of a month that has less than 31 days
  (February, April, June, September and November), please refer to “Date adjustment at the end of the month”

First, set the 24-hour hand and the minute hand.

1. Pull out the crown to the second click when the seconds hand is pointing at the 0 second position. The seconds hand stops moving.

   • For models with screw down crown, please unlock the crown before operating it.
   • Pull out the crown to the second click when the seconds hand is pointing at the 0 second position.

2. Turn the crown to set the time of the 24- hour hand and the minute hand. In order to set the time accurately, turn the minute hand 4 to 5 minutes ahead and then return it to the correct time .

   • As the hour hand moves together, it may point to a different time from the one you wish to set, or the date may change. Please set the minute hand and the 24- hour hand first.

3. Push the crown back in to the normal position
   Thereby, the 24-hour hand, the minute hand and the seconds hand will be in alignment.

   • Time signal service is useful for second setting.

4. Pull out the crown to the first click.

   • The seconds hand continues moving

5. Turn the crown to set the date and the hour hand.Each time the hour hand makes two full rotations, the date is adjusted one day. While turning the crown, the moment the date changes is midnight.
   Please be sure that AM/PM is set correctly and thenset the time.

   • The crown can be turned in either direction, however, it is recommended that you turn the crown in the direction which enables you to set the date withsmaller adjustments.
   • Turn the crown slowly, checking that the hour handmoves in one-hour increments.
   • When adjusting the hour hand, the other hands may move slightly. However, this is not a malfunction.

6. Push the crown back in to the normal position.

   • For models with screw down crown, please be sure to lock the crown after operating it.

Date adjustment at the end of the month
It is necessary to adjust the date at the end of February and 30-day months.

Ex.) To adjust the date in the A.M. period on the first day of a month following a 30-day month

• The watch displays “31” instead of “1.” Pull out the crown to the first click.
• Turn the crown to set the date to “1” and then push the crown back in to the normal position.
  • Each time the hour hand makes two full rotations, the date is adjusted by one day.
  • For models with screw down crown, please be sure to lock the crown after operating it.

How to use the 24-hour hand
There are two ways to use the 24-hour hand as follows.

Distinguishing between AM and PM (Standard usage type)
The time indicated by the hour and minute hand is shown in 24-hour format

Example

• Hour hand, date: Japan
• 24-hour hand: Japan
• Japan: At 10:08 AM on 6th

Indicating the time of two different regions (As a dual time indicator)
It is possible to indicate the time of a region that is different from the time indicated by the hour and minute hand.
The watch offers two display modes. You can choose it depending on your needs and preferences.

• “Time difference adjustment function” → P.24
• “How to set the time and date” → P.18

Time difference adjustment function

When using the watch in a region with a different time zone, you can easily set the watch to indicate the local time.
The time can be adjusted without stopping the watch.
The hour hand and the date move in tandem. By setting the hour hand, it is adjusted to indicate the date of your desired region having different time zone.
The time difference can be adjusted in one-hour increments.

How to use the time difference adjustment function

1. Make sure that the hour hand, minute hand and the date correctly indicate the time and date of the region before changing the time zone.
   • “How to set the time and date” → P.18
2. Pull out the crown to the first click.
   • The seconds hand continues moving. For models with screw down crown, please unlock the crown before operating it.
3. Turn the crown to set the hour hand and the date to indicate the time of the region you wish to set.Please set it after making sure that the date and AM/PM are correctly set.
   • Please set it by referring to “List of time zone differences in major regions of the world” → P.26.
   • During this operation, the hour hand and the date move in tandem. If AM/PM is not correctly set, the date may be off by 12 hours. While turning the crown, the moment the date changes is midnight.
   • Turn the crown slowly, checking that the hour hand moves in one-hour increments.
   • When adjusting the hour hand, the other hands may move slightly. However, this is not a malfunction.
   • When you set the time to any time between 9:00 PM and midnight, by turning the hour hand counterclockwise passing midnight, move the hour hand back to 8:00 PM, and then carry out the setting. (It is an operation to move the date back.)
4. Push the crown back in to the normal position.
   • For models with screw down crown, please be sure to lock the crown after operating it.

List of time zone differences in major regions of the world

• To adjust the time difference, please refer to “How to use the time difference adjustment function” → P.24.

Name of the

representing cities

| Time difference

from Japan

| Time difference

from UTC

| Other cities
---|---|---|---
WellingtonH| +3 hours| +12 hours| AucklandH
Noumea| +2 hours| +11 hours|
SydneyH| +1 hour| +10 hours| Guam Island
Tokyo| ±0 hour| +9 hours| Seoul, Pyongyang
Hong Kong| -1 hour| +8 hours| Beijing, Singapore
Bangkok| -2 hours| +7 hours| Jakarta
Dhaka| -3 hours| +6 hours|
Karachi| -4 hours| +5 hours|
Dubai| -5 hours| +4 hours|
Jeddah| -6 hours| +3 hours|
Cairo| -7 hours| +2 hours| AthensH

UTC = Coordinated Universal Time
UTC is a universal standard time determined by international agreements. It is used as the official time around the world when recording the time. UTC is a time coordinated by adding leap seconds to the “International Atomic Time (UTI)” determined from atomic clocks in the world, in order to correct the deviation from the astronomically defined universal time (UT).

In the regions marked with H, daylight saving time is introduced. (As of May 2022)

Name of the

representing cities

| Time difference

from Japan

| Time difference

from UTC

| Other cities
---|---|---|---
ParisH| -8 hours| +1 hour| RomeH, BerlinH
LondonH| -9 hours| ±0 hour|
Azores IslandsH| -10 hours| -1 hour|
Rio de Janeiro| -12 hours| -3 hours|
Santo Domingo| -13 hours| -4 hours|
New YorkH| -14 hours| -5 hours| MontrealH
ChicagoH| -15 hours| -6 hours| Mexico CityH
DenverH| -16 hours| -7 hours|
Los AngelesH| -17 hours| -8 hours|
AnchorageH| -18 hours| -9 hours|
Honolulu| -19 hours| -10 hours|
Midway Island| -20 hours| -11 hours|

• There are time zone differences around the world based on time offsets from Coordinated Universal Time (UTC). The world is divided into 24 time zones where each part has a time difference of one hour. This system is adopted internationally in such a way that one full rotation of the earth corresponds to 24 hours (one day).
  Depending on the country or the region, daylight saving time (summer time) is adopted individually.

• Daylight saving time, being defined as time difference +1 hour, is a system that advances the time by 1 hour during summer time to prolong the daylight hours.

• Time difference and daylight saving time are subject to change depending on the conditions of the respective countries or regions.

How to use the rotating bezel

By setting the rotating bezel beforehand, the elapsed time since the start of an event can be measured.

1. At the start of the event, for which you want to measure the elapsed time (for example, when you start diving), rotate the bezel so that the mark on the bezel is aligned with the minute hand.

   • The rotating bezel is designed to rotate only counterclockwise.
     Do not forcibly rotate it clockwise.
     “[One-Way rotating bezel]” → P.29

2. Read the graduation on the rotating bezel to which the minute hand is pointing.
   The graduation on the rotating bezel to which the minute hand is pointing indicates the elapsed time.

The above illustration is provided as an example, therefore it may not be exactly the same as your watch. EN 28

[One-Way rotating bezel]
As the evaluation of the remaining air in your cylinder is based on the information of the elapsed time of the dive, the rotating bezel for a diver’s watch is designed to rotate only counterclockwise, so that the watch is prevented from displaying the elapsed time shorter than it actually is.

CAUTION: Make sure that you check the correct remaining amount of air in your cylinder before diving. Use the display of the elapsed time by the rotating bezel only as a guide during diving.

Charging the battery

How to charge the battery
Expose the dial to light to charge the watch.

To ensure optimal performance of the watch, make sure that the watch is kept sufficiently charged at all times.
Under the following situations, the energy of the watch is likely to be depleted, resulting in stoppage of the watch:

• The watch is concealed under a sleeve.
• The watch is used or stored under conditions where it cannot be exposed to light for a long time.
  • Be careful to make sure that the watch does not get hot when it is charging. (The operating temperature range is -10°C to +60°C.)
  • When you first start using the watch or starting it after it stopped due to a lack of charge, charge the watch sufficiently using the table on P.31 as a guide.

Guide to charging times

Charge the watch using the times below as a guide.
The figures of “Time required for charging the watch to start moving at one- second intervals” are estimations of time required to charge the stopped watch by exposing it to light until it moves at steady one-second intervals. Even if the watch is partially charged for a shorter period, the watch will resume one-second interval movement. However, it may shortly return to two-second interval movement. Use the charging time in this column as a rough guide for sufficient charging time.

• The required charging time slightly varies depending on the model of the watch.

Illuminance lx (LUX)

|

Light source

|

Condition (Example)

| Time required for fully charging the watch| Time required for charging the watch to start

moving at one- second intervals

| Time required for charging the watch to last for 1 day
---|---|---|---|---|---
700| Fluorescent light| General offices| –| 17 hours| 2 hours
3,000| Fluorescent light| 30 W 20 cm| 190 hours| 4 hours| 35 minutes
10,000| Sunlight| Cloudy day| 55 hours| 1 hour| 10 minutes
100,000| Sunlight| Sunny day (Under direct sunlight on a summer

day)

| 15 hours| 20 minutes| 3 minutes

About energy

When the energy stored in the watch is running down, the seconds hand starts moving at two-second intervals.

• If the energy runs out, the watch will stop.
• If the seconds hand starts moving at two-second intervals, fully charge the watch.
• How to charge the battery → P.30
• Guide to charging times → P.31

Overcharge prevention function
When the secondary battery is fully charged, the overcharge prevention function is automatically activated to avoid further charging.
There is no need to worry about damage caused by overcharging no matter how much the secondary battery is charged in excess of the “time required for fully charging the watch.”

• For the required time to fully charge the battery, see “Guide to charging times” → P.31.

WARNING

Notes on charging the watch

• When charging the watch, do not place the watch in close proximity to an intense light source such as lighting equipment for photography, spotlights or incandescent lights, as the watch may be excessively heated resulting in damage to its internal parts.
• When charging the watch by exposure to direct sunlight, avoid places that easily reach high temperatures, such as a car dashboard.
• Always keep the watch temperature under 60°C

Power Source

• The battery used in this watch is a special secondary battery, which is different from ordinary batteries.
• Unlike an ordinary silver oxide battery, the secondary battery does not require periodic replacement.
• The capacity or charging efficiency may gradually lower due to long-term use or operating environment.
• In addition, long-term use may shorten the charge duration due to wear, contamination, lubricant deterioration of mechanical parts, etc. Request repair when the performance lowers.

WARNING

• Notes on replacing the secondary battery

  • Do not remove the secondary battery from the watch.
    Replacement of the secondary battery requires professional knowledge and skill. Please ask the retailer from whom the watch was purchased for replacement of the secondary battery.

  • Installation of an ordinary silver oxide battery can generate heat that can cause bursting and ignition.

Daily care

• The watch requires good daily care

• Do not wash the watch when its crown is in the extended position.

• Wipe away moisture, sweat or dirt with a soft cloth.

• After soaking the watch in seawater, be sure to wash the watch in clean pure water and wipe it dry carefully.
  Do not pour running water directly from a faucet onto the watch. Put some water into a bowl first, and then soak the watch in the water to wash it.

  • If your watch is rated as “Non-water resistant” or “water resistant for everyday life,” do not wash the watch. “Performance and type” → P.36

Turn the crown from time to time

• In order to prevent corrosion of the crown, turn the crown from time to time.
• The same practice should be applied to a screw down crown.
  “Screw down crown” → P.17

Performance and type

The case back shows the caliber and performance of your watch

The above illustration is provided as an example, therefore it may not be exactly the same as your watch.

Magnetic resistant performance
Affected by nearby magnetism, a watch may temporarily gain or lose time or stop operating.
Diver’s watches feature magnetic resistant performance which is equivalent to or above JIS Class 1.

If the watch becomes magnetized and its accuracy deteriorates to an extent exceeding the specified rate under normal use, the watch needs to be demagnetized. In this case, you will be charged for demagnetization and accuracy readjustment even if it happens within the guarantee period.

The reason why a watch is affected by magnetism
The built-in motor is provided with a magnet, which may be influenced by a strong external magnetic field.

Lumibrite

If your watch has Lumibrite

Lumibrite is a luminous paint that absorbs the light energy of sunlight and lighting apparatuses in a short time and stores it to emit light in the dark. For example, if exposed to a light of more than 500 lux for approximately 10 minutes, Lumibrite can emit light for 3 to 5 hours. Please note, however, that, as Lumibrite emits the light it stores, the luminance level of the light decreases gradually over time. The duration of the emitted light may also differ slightly depending on such factors as the brightness of the place where the watch is exposed to light and the distance from the light source to the watch.

• In general, when coming from a place that is bright to a place that is dark, it takes human eyes some time to adapt to the darkness making it difficult to see objects initially. (Dark adaptation)
• Lumibrite is luminous paint that stores and emits light, which is harmless to human beings and the environment, containing no toxic materials such as radioactive substances.

< Brightness levels>

Examples of common magnetic products that may affect watches

Band: The band touches the skin directly and becomes dirty with sweat or dust. Therefore, lack of care may accelerate deterioration of the band or cause skin irritation or stain on the sleeve edge. The watch requires a lot of attention for long usage.

Metallic band

• Lack of care may result in a rash or cause a yellowish or gold stain on the lower sleeve edge of shirts.
• Wipe off moisture, sweat or soil with a soft cloth as soon as possible.
• To clean the soil around the joint gaps of the band, wipe it out in water and then brush it off with a soft toothbrush. (Protect the watch body from water splashes by wrapping it up in plastic wrap etc.)

Clean it off with a soft cloth.

• Because some titan bands use pins made of stainless steel, which has outstanding strength, rust may form in the stainless steel parts.
• If rust advances, pins may poke out or drop out, and the watch case may fall off the band, or the clasp may not open.
• If a pin is poking out, personal injury may result. In such a case, refrain from using the watch and request repair.

Polyurethane band

• A polyurethane band is susceptible to discoloration from light, and may be deteriorated by solvent or atmospheric humidity.
• Especially a translucent, white, or pale colored band easily adsorbs other colors, resulting in color smears or discoloration.
• Wash out dirt in water and clean it off with a dry cloth. (Protect the watch body from water splashes by wrapping it up in plastic wrap etc.)
• When the band becomes less flexible, have the band replaced with a new one. If you continue to use the band as it is, the band may develop cracks or become brittle over time.

Silicone band

• As for material characteristics, the band is easily dirtied, and may be stained and discolored. Wipe off dirt with a wet cloth or cleaning tissue.
• Unlike bands of other materials, cracks may result in the band being cut. Take care not to damage the band with an edged tool.

How to use the diver adjuster

If your watch’s metallic band has the Diver Adjuster function, the length of the band can be easily adjusted.
It is very useful when you wear the watch over a wet suit or winter clothing.

1. Lift up the flap approximately 90°until it stands upright, and then press the flap down further approximately 20°and lightly hold it.
   • When doing so, take care not to push the flap forcibly. Although you may feel slight resistance, doing this requires only a light force.
2. Lightly pull the band on the 6 o’clock side of the watch along the curved line of the band to pull out the slider.
   • Doing this requires only a light force. Take care not to pull the band forcibly.
   • The slider can be pulled out approximately 30 mm. Take care not to pull it out more than this limit.
3. While pressing the push button, lift up the clasp to release the buckle, and place the watch on your wrist.
4. Close the clasp (4-1) first and then, the flap (4-2).
5. Hold both sides of the band to adjust the length of the slider until it fits snugly around your wrist.

How to use the diver extender

If your watch’s metallic band has the Diver Extender function, the length of the band can be easily adjusted.
It is very useful when you wear the watch over a wet suit or winter clothing.

1. Lift up the flap.

2. While pressing the push button, open the clasp.

   • After opening the clasp, push the flap back to the normal position for safety’s sake.

3. Open the two-piece foldover portion of the Diver Extender in the direction of the arrow.

   • Some force is required to open the foldover portion, and it will click when it is opened.

4. Slide the upper cover of the
   Diver Extender in the direction of the arrow, and then, pull it up to extend the two-piece foldover portion to the full extent.

5. Place the watch on your wrist, and close the clasp (5-1) first and then, the flap (5-2).

   • To fold up the Diver Extender, reverse the procedure above. When the two-piece folder portion of the Diver Extender is folded up completely, it also clicks in the same manner as when it is opened.

After-sales service

Notes on guarantee and repair

• Contact the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER
  for repair or overhaul.

• Within the guarantee period, present the certificate of guarantee to receive repair services.

• Guarantee coverage is provided in the certificate of guarantee.
  Read carefully and retain it.

• For repair services after the guarantee period has expired, if the functions of the watch can be restored by repair work, we will undertake repair services upon request and payment.

Replacement with functional parts

• Please keep in mind that if original parts are not available, they may be replaced with substitutes whose outward appearance may differ from the originals.

Inspection and adjustment by disassembly and cleaning (Overhaul)

• Periodic inspection and adjustment by disassembly and cleaning (overhaul) is recommended approximately once every 3 to 4 years in order to maintain optimal performance of the watch for a long time. According to use conditions, the oil retaining condition of your watch mechanical parts may deteriorate, abrasion of the parts may occur due to contamination of oil, which may ultimately lead the watch itself to stop.
  As the parts such as gasket may deteriorate, water-resistant performance may be impaired due to intrusion of perspiration and moisture.
  Please contact the retailer from whom the watch was purchased for inspection and adjustment by disassembly and cleaning (overhaul). For replacement of parts, please specify “SEIKO GENUINE
  PARTS.” When asking for inspection and adjustment by disassembly and cleaning (overhaul), make sure that the gasket and push pin are also replaced with new ones.

• When your watch is inspected and adjusted by disassembly and cleaning (overhauled), the movement of your watch may be replaced.

CAUTION: Depending on the environment where a diver’s watch is used, its inner parts or movement as well as its case or band may be affected. We recommend that you have your watch overhauled regularly once every 3 or 4 years.

Troubleshooting

you wear the watch every day and this occurs, the most likely cause is the watch is hidden by your sleeves or other clothing when you wear it and it is not sufficiently exposed to light.| Sufficiently charge the battery until the seconds hand moves every second.

When you wear the watch, try to make sure that the watch is not hidden by your sleeves or other clothing.

Additionally, when you take the watch off, try to place it in a bright place.

|

P.30

The seconds hand is moving at two- second intervals.

The stopped|  |  |
watch was|  |  |
exposed to an|  |  |
adequate light for|  |  |
longer than “the time required to fully charge the watch,” however, it does not resume its normal one-|

The light is too weak.

More time is required to fully charge the watch.

| The time taken to charge will differ depending on the light intensity. For details on charging times, see “Guide to charging times”.|

P.31

second interval|  |  |
movements or|  |  |
even does not|  |  |
start operating.|  |  |
Troubles| Possible causes| Solutions| Reference
---|---|---|---

The watch temporarily gains/ loses time.

|

The watch has been left in extremely high or low temperatures for a long time.

| If the watch returns to room temperature, the accuracy will return to its original state.

If it does not return to its original state, contact the retailer from whom the watch was purchased.

|

–

The watch has been left close to an object with a strong magnetic field.

| Correct this condition by moving and keeping the watch away from the magnetic source, and reset the time. If this action does not correct the condition, contact the retailer from

whom the watch was purchased.

|

–

You drop the watch, hit it against a hard surface, or wear it while playing active sports.

The watch is exposed to strong vibrations.

| If accuracy does not return after setting the time, consult the retailer from whom the watch was purchased.|

–

The date changes

at 12 o’clock noon.

| AM/PM is not properly set.| Advance the hands by 12 hours.| P.18
Blur in the display persists.| A small amount of water has got inside the watch due to deterioration

of the gasket, etc.

| Consult the retailer from whom the watch was purchased.| –

Specifications

2. Frequency of crystal oscillator

3. Loss/gain (Monthly rate)

| 32,768 Hz (Hz= Hertz, cycles per second)
Monthly average loss/gain ± 15 seconds

Only if worn on the wrist in a temperature range of 5°C to 35°C

4. Operational temperature

range

| -10 °C ~ +60 °C
5. Driving system| Step motor system
6. Power source| Secondary battery, 1 piece
7. Duration| Approx. 9 months
8. IC (Integrated Circuit)| Oscillator, frequency divider and driving circuit C-MOSIC, 1 piece

https://www.seikowatches.com/

References

• SEIKO WATCH | Seiko Watch Corporation

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