Seiko Diving Watch User Manual and Care Guide

Warnings and Precautions

General Warnings

• ⚠️ PRECAUTION: Do not attempt to dive with the watch without prior training required for diving. For your safety, observe diving rules.
• ⚠️ PRECAUTION: Do not use the watch for deep dives using helium gas mixtures.
• ⚠️ PRECAUTION: Before diving, check that the watch is functioning normally.

Important Notes

• ⚠️ ATTENTION: Please study this brochure and follow the instructions within to ensure the reliability of your diving watch.
• ⚠️ ATTENTION: Do not operate the crown while the watch is wet or submerged in water.
• ⚠️ ATTENTION: Avoid striking the watch against hard objects such as rocks and stones.

Precautions for Diving Watch Use

Before diving, check that the watch is functioning normally and be sure to observe the precautions described below.

Before Diving

• Do not use the watch for deep dives with helium gas mixtures.
• Check that:
  • The crown is securely locked.
  • There are no visible damages on the watch band and glass.
  • The strap/bracelet is securely attached to the watch case.
  • The strap/bracelet is fastened and fits snugly on the wrist.
  • The rotating bezel moves smoothly counter-clockwise (its rotation should be neither too loose nor too tight), and the indicator is aligned with the minute hand.
  • Time and calendar data are set correctly.
  • The second hand is operating normally (if not, shake the watch several times for about 30 seconds to ensure effective mainspring winding).

In case of any malfunction, we recommend contacting a SEIKO SERVICE CENTER.

During Diving

• Do not operate the crown while the watch is wet or submerged in water.
• Avoid striking the watch against hard objects such as rocks and stones.
• The bezel may be stiffer underwater. This is not a malfunction.

After Diving

• After diving, rinse the watch in fresh water to remove sea water, sand, dirt, etc.
• To prevent the watch case from rusting, wipe the watch dry after rinsing.

Seiko Diving Watches

Caliber 4R15/4R16/4R35/4R36/7S26/7S35/7S36

This section provides an overview of the watch components and different caliber designations.

Specifications

• Water resistance: 200 meters
• Suitable for scuba diving.
• Rotating bezel: For measuring elapsed time up to 60 minutes.
• Crown: Screw-down locking crown.
• Time/Calendar:
  • Calibers 4R16/4R36/7S26/7S36: Hour, minute, and second hands; Day; Date.
  • Calibers 4R15/4R35/7S35: Hour, minute, and second hands; Date.
• Second hand stop function when crown is pulled out (4R35/4R36).

How to Start the Watch

For Calibers 4R15/4R16/7S26/7S35/7S36 (Mechanical Automatic Winding)

• To start the watch: Shake the watch horizontally for about 30 seconds.
• When worn on the wrist, the mainspring is wound by the movement of your arm.
• If the watch is not worn, accuracy may be affected. To avoid this, wear the watch for at least 8 hours daily.

For Calibers 4R35/4R36 (Mechanical Automatic and Manual Winding)

These watches feature both automatic and manual winding functions.

To start the watch:

If the watch has stopped, it is recommended to wind it manually by rotating the crown.

Manual Winding Procedure using the Crown:

1. Unscrew the crown counter-clockwise to release it from the locked position.
2. Slowly rotate the crown clockwise.
3. Continue rotating the crown until the mainspring is fully wound. The second hand will start moving.
4. To lock the crown, push it in and screw it clockwise.

Setting the Time and Calendar

For Caliber 4R16/7S26/7S36

1. Unscrew the crown against the crown's rotation to release it from the locked position.
2. Pull the crown out to the first click.
3. Rotate the crown counter-clockwise to set the previous day's date.
4. Pull the crown out to the second click.
5. Rotate the crown clockwise to set the previous day of the week in the desired language.
6. Rotate the crown to set the date and day of the week. The date and day of the week will change automatically as the time passes midnight.
7. To set the time, rotate the crown to advance the hour and minute hands.
8. Push the crown back to its normal position, synchronized with a time signal.
9. To lock the crown, push it in and screw it clockwise.

Note: Do not set the date and day of the week between 21:00 and 04:00.

For Caliber 4R15/7S35

1. Unscrew the crown against the crown's rotation to release it from the locked position.
2. Pull the crown out to the first click.
3. Rotate the crown counter-clockwise to set the previous day's date.
4. Pull the crown out to the second click.
5. Rotate the crown to set the date. The date will change automatically as the time passes midnight.
6. To set the time, rotate the crown to advance the hour and minute hands.
7. Push the crown back to its normal position, synchronized with a time signal.
8. To lock the crown, push it in and screw it clockwise.

Note: Do not set the date between 21:00 and 1:00.

For Caliber 4R36

1. Unscrew the crown against the crown's rotation to release it from the locked position.
2. Pull the crown out to the first click.
3. Rotate the crown counter-clockwise to set the previous day's date.
4. Pull the crown out to the second click.
5. Rotate the crown clockwise to set the previous day of the week in the desired language.
6. Rotate the crown to set the date and day of the week. The date and day of the week will change automatically as the time passes midnight.
7. To set the time, rotate the crown to advance the hour and minute hands.
8. Push the crown back to its normal position, synchronized with a time signal.
9. To lock the crown, push it in and screw it clockwise.

Note: Do not set the date and day of the week between 21:00 and 04:00.

For Caliber 4R35

1. Unscrew the crown against the crown's rotation to release it from the locked position.
2. Pull the crown out to the first click.
3. Rotate the crown counter-clockwise to set the previous day's date.
4. Pull the crown out to the second click.
5. Rotate the crown to set the date. The date will change automatically as the time passes midnight.
6. To set the time, rotate the crown to advance the hour and minute hands.
7. Push the crown back to its normal position, synchronized with a time signal.
8. To lock the crown, push it in and screw it clockwise.

Note: Do not set the date between 21:00 and 1:00.

Rotating Bezel

The rotating bezel can indicate elapsed time up to 60 minutes.

1. Rotate the bezel so that the desired time marker aligns with the minute hand.
2. After some time, check the bezel marker indicated by the minute hand. The difference between the markers indicates the elapsed time.

Example:

• Start time: 10:10
• End time: 10:40
• Elapsed time: 30 minutes

Note: For safety, the bezel can only be rotated counter-clockwise to ensure the measured time is never shorter than the actual elapsed time.

Maintaining Your Watch's Quality

Temperature Range

The main components of mechanical watches are made of metals that expand or contract with temperature changes, affecting accuracy. Mechanical watches may run slower in high temperatures and faster in low temperatures.

Magnetism

Strong magnetic fields can adversely affect watch performance. Avoid leaving the watch in places exposed to strong magnetic fields.

Chemicals

Do not expose the watch to chemicals such as mercury, solvents, cosmetic sprays, detergents, glue, or paints. Otherwise, the watch case, bracelet, and other parts may discolor, be damaged, or deteriorate.

Periodic Checks

We recommend having your watch checked by an AUTHORIZED DEALER or SERVICE CENTER every 2-3 years to ensure the integrity of the case, crown, gasket, and water resistance.

Care for Watch Case and Bracelet

To prevent possible rusting of the case and bracelet, periodically wipe them with a soft, dry cloth.

Impacts and Shocks

Try not to drop the watch or strike it against hard surfaces.

Protective Film on Watch Case

If a protective film/sticker is attached to the back of your watch, remove it before using the watch.

LUMIBRITE™

LumiBrite™ is a luminescent paint that is completely harmless to humans and the environment, containing no harmful materials such as radioactive substances.

LumiBrite™ is a new type of luminescent paint that absorbs energy from sunlight and light sources in a short period and emits light in the dark.

For example, exposing the watch to light with an intensity of over 500 Lux for approximately 10 minutes is sufficient for LumiBrite™ to emit light for 5-8 hours.

However, please note that LumiBrite™ emits stored light, and therefore, the light intensity decreases over time. The duration of the glow may also vary slightly depending on factors such as the brightness of the lighting where the watch was exposed to light, and the distance between the light source and the watch.

If you go diving to depths where light does not reach, LumiBrite™ will only glow if it has absorbed and stored enough light energy. Therefore, before diving, expose the watch to light so that it absorbs and stores sufficient light energy. Otherwise, use the watch with a dive light.

Information on Luminosity

• (A) Sunlight [Clear sky]: 100,000 Lux [Cloudy sky]: 10,000 Lux
• (B) Indoors (Daytime outside window) [Clear sky]: Over 3,000 Lux [Cloudy sky]: 1,000 to 3,000 Lux [Rainy weather]: Less than 1,000 Lux
• (C) Light sources (40W fluorescent lamp) [Distance to watch: 1m]: 1,000 Lux [Distance to watch: 3m]: 500 Lux (average room illumination) [Distance to watch: 4m]: 250 Lux

* LUMIBRITE™ is a trademark of SEIKO HOLDINGS CORPORATION.

Specifications

* Specifications are subject to change without notice for product improvement.