SEIKO 5R65 Divers Watch Instruction Manual

Introduction

Thank you for choosing a SEIKO watch. To ensure the correct and safe use of your SEIKO watch, please read the instructions in this booklet carefully before operation. Keep this manual handy for future reference.

Note on Bracelet Adjustment: Adjustment of metal bracelets is available at retail stores where the watch was purchased. If you cannot return the watch to the original point of purchase (e.g., it was a gift, or you have moved), please contact a SEIKO CUSTOMER SERVICE CENTER. This service may also be available at other retail stores for a fee, though not all stores offer it.

Protective Film: If a protective film is applied to prevent scratches, be sure to remove it before use. If left on, dirt, sweat, or moisture can accumulate underneath, potentially leading to rust.

Important Safety Instructions

⚠️ ATTENTION

Please read the following instructions carefully before operating the watch and strictly adhere to them.

❗ WARNING

During dives, never perform any operations other than those specified in this manual. Incorrect handling or misinterpretation of displayed information could lead to death or serious injury.

❗ WARNING

Diver's watches are auxiliary devices primarily for indicating time, not for ensuring user safety. Use these watches in conjunction with necessary equipment (e.g., depth gauge, submersible pressure gauge) for safe diving.

❗ WARNING

These watches are suitable for scuba diving. For scuba diving, you must possess the necessary skills and experience. Ensure you are familiar with all rules for operating and handling the watch, and check the watch before each dive. Do not attempt to dive with these watches until these conditions are met.

Precautions Before Diving

❗ WARNING

Strictly observe the following safety rules. Failure to do so may result in serious consequences, including the risk of severe injury.

Immediately stop wearing the watch if any of the following occur:

• Rust appears on the case or bracelet.
• Pins securing bracelet links protrude.

Consult your retailer or contact a SEIKO CUSTOMER SERVICE CENTER immediately.

Keep watches and accessories out of reach of children. Be careful to prevent children from accidentally swallowing any watch parts. Seek immediate medical attention if a child swallows a watch part or battery, as it can be harmful.

⚠️ ATTENTION

Observe the following safety rules to avoid the risk of minor injuries or damage to the watch.

Avoid wearing or storing the watch in the following locations:

• Areas where volatile substances evaporate (e.g., nail polish remover, insect repellent, thinners).
• Areas where temperatures consistently drop below 5°C (41°F) or exceed 35°C (95°F).
• Areas exposed to strong magnetism or static electricity.
• Areas exposed to strong vibrations.
• Areas with high humidity.
• Areas with high dust levels.

If Allergic Reactions or Skin Irritation Occur

Stop wearing the watch immediately and consult a specialist, such as a dermatologist or allergist.

Other Precautions

• Adjusting the metal bracelet requires specific knowledge and skill. Consult the retail store where you purchased the watch. Attempting to adjust it yourself may cause injury or damage to the bracelet parts.
• Do not disassemble or modify the watch.
• Keep watches out of reach of children. Exercise extreme caution to prevent children from direct contact with the watch, protecting them from potential injury, allergic reactions, or itching.
• If your watch is a pendant or charm type, the strap or chain attached may damage clothing or injure your body.

Order of Use

1. Precautions Before Diving

⚠️ ATTENTION

Always observe the rated diving depth indicated on the dial or case back. Never use the watch at depths exceeding the rated limit.

⚠️ ATTENTION

During dives, never perform any operations on the watch other than those specified in this manual.

⚠️ ATTENTION

Before using the watch for diving, you must receive proper training in various types of diving and acquire the necessary experience and skills for safe diving. Strictly observe established rules during dives. Failure to do so may result in serious consequences, including the risk of severe injury.

❗ WARNING

Strictly observe the following safety rules. Failure to do so may result in minor injuries or damage to the watch.

• Do not rotate or pull out the crown when the watch is wet. Water may enter the watch.
• If the inside of the glass fogs up due to condensation, or if water droplets remain inside for an extended period, the watch's water resistance may be compromised. Consult your retailer or a SEIKO CUSTOMER SERVICE CENTER immediately.
• Do not allow moisture, sweat, or dirt to remain on the watch for extended periods.
• Remember that the watch's water resistance may decrease due to the deterioration of adhesive properties for the glass or gaskets.
• Remove the watch before bathing or visiting a sauna. Steam, soap, and certain compounds in hot springs can reduce water resistance.

Before Diving Check:

Check the following before diving:

1. Time Setting: Ensure the time is set correctly. (Refer to "Names of Parts and Their Functions" → Page 16)
2. Power Reserve Indicator: The indicator shows the remaining power reserve is at least half full. If less than half, manually wind the power spring. (Refer to "How to Wind the Power Spring Manually" → Page 18)
3. Rotating Bezel: The bezel rotates smoothly. (It should not rotate too quickly or too slowly). (Refer to "How to Use the Rotating Bezel" → Page 28)
4. Crown: The screw-lock crown is fully screwed down. (Refer to "Screw-Lock Crown" → Page 17)
5. Glass/Strap: There are no visible cracks or scratches on the glass or strap.
6. Bracelet: The bracelet is securely attached to the watch (using spring bars, clasps, or other fasteners).

❗ WARNING

In case of any malfunction, consult the retail store where you purchased the watch or a SEIKO CUSTOMER SERVICE CENTER.

2. During Diving

⚠️ ATTENTION

Observe the following precautions.

• The watch can be used for shallow (air) dives or scuba diving within the water-resistant depth indicated on the watch.
• Be careful not to strike the watch against hard objects, such as rocks.
• Do not operate the crown or buttons underwater.
• Bezel rotation may be slightly stiff in water; this is not a malfunction.

3. After Diving

⚠️ ATTENTION

Follow the watch care instructions below after diving.

• Rinse the watch with fresh water to remove any salt residue and dry it thoroughly to prevent rust.
• Do not pour tap water directly onto the watch. First, pour some water into a basin, then immerse the watch and rinse it.

❗ WARNING

Depending on the environment where the watch was used for diving, the movement of parts or internal components may be affected, or the case or bracelet may be damaged. We recommend regular servicing of the watch every 3 to 4 years.

4. Case Construction

For models listed below, be aware of the following operational features:

The bezel or protective outer case is secured with set screws. Never loosen these set screws.

[Diagram description: Illustration showing the watch case with arrows pointing to 'set screw' (установочный винт) on the bezel and outer case.]

❗ WARNING

Never loosen the set screws that secure the bezel or protective outer case. Failure to do so may result in damage to the watch or further loosening of the screws. If you notice that the set screws have loosened or the watch is malfunctioning, consult your retailer or a SEIKO CUSTOMER SERVICE CENTER.

5. Water Resistance

Water Resistance for Scuba Diving:

This watch is specifically designed for scuba diving that may involve the use of helium-enriched breathing mixtures. Always observe the rated diving depth indicated on the dial or case back. Never use the watch at depths exceeding the rated limit.

[Diagram description: Illustration of the watch dial and case back showing markings like "SEIKO MARINEMASTER SPRING DRIVE PROFESSIONAL 600m", "DIVER'S WATCH 300m", "SATURATION D", "TITANIUM 5R65-0000", "MADE IN JAPAN", and a depth range indicator.]

[Diagram description: Illustration showing the dial with hands and bezel.]

Names of Parts and Their Functions

[Diagram description: An exploded view of the watch face showing numbered parts: 1. Hour hand, 2. Minute hand, 3. Second hand, 4. Power reserve indicator hand, 5. Date window, 6. Rotating bezel, 7. Crown. The crown is shown in three states: normal position (unlocked), first click, and second click.]

1. Hour hand
2. Minute hand
3. Second hand
4. Power reserve indicator hand
5. Date
6. Rotating bezel
7. Crown
   • Normal position (unlocked): Wind the watch.
   • First click position: Adjust time difference / set date.
   • Second click position: Set time.

Screw-Lock Crown

The screw-lock crown is equipped with a mechanism that securely locks the crown when not in use, preventing operational errors and improving water resistance. To wind the watch using the crown, first unlock it, then pull it out.

Unlocking the Crown: Rotate the crown counter-clockwise to unlock it. The crown can then be used. (Unlock the crown before use.)

[Diagram description: Illustration showing the crown being unscrewed counter-clockwise, labeled "Unscrew". The crown is shown in a locked state and an unlocked state.]

Locking the Crown: Rotate the crown clockwise, gently pushing it towards the case, until it stops turning. (When locking the crown, rotate it carefully so the screw engages properly. Do not force the crown, as this may damage the screw hole in the case.)

[Diagram description: Illustration showing the crown being screwed clockwise, labeled "Screw down". The crown is shown in an unlocked state and a locked state.]

How to Wind the Power Spring (Manual Winding)

This is an automatic watch with a manual winding mechanism.

• When worn on the wrist, the wearer's movements wind the spring.
• For the first use of a stopped watch, it is recommended to manually wind the spring by turning the crown.

How to Wind the Power Spring Manually:

The crown is a push-type winding crown. Turn the crown counter-clockwise to unlock it. When fully unlocked, the crown will protrude from its original position.

[Diagram description: Illustration showing the watch crown being pulled out to the unlocked position.]

1. After unlocking the crown, slowly turn it clockwise to wind the spring. Be careful not to push the crown in.

[Diagram description: Illustration showing the crown being turned clockwise to wind the spring.]

Note: If you manually wind the crown five full turns, it provides approximately ten hours of power reserve. Turning the crown counter-clockwise does not wind the spring.

2. Wind the spring until the power reserve indicator shows a fully wound state. The second hand will start moving immediately.

[Diagram description: Illustration showing the power reserve indicator at its maximum.]

How to check the spring's wound state: See "How to Read the Power Reserve Indicator" → (Page 26).

When the spring is fully wound, further winding is unnecessary. The crown can be turned further without damaging the watch mechanism; the spring will not be over-wound.

3. Carefully turn the crown clockwise while pushing it in, until it is fully recessed into the case and locked.

[Diagram description: Illustration showing the crown being pushed in and screwed down.]

Note: When the crown is pushed into the case, you may hear a click – this indicates the spring is wound. This is normal and occurs when the spring is engaged.

Setting Time and Date

The watch features a date function and is designed so that the date changes approximately every 24 hours. The date changes around midnight. If the AM/PM setting is incorrect, the date will change at noon.

❗ WARNING

Do not set the date between 9:00 PM and 1:00 AM. Changing the date during this period may cause issues, such as the date failing to advance to the next day.

1. Unlock the crown. (Refer to "Screw-Lock Crown" → Page 17)
2. Pull the crown out to the first click position.

[Diagram description: Illustration showing the crown pulled out to the first click position.]

3. The date can be set by turning the crown counter-clockwise. Turn it until the previous day's date is displayed. For example, to display the date "6", first set it to "5". Then, turn the crown counter-clockwise to set the date.
4. Pull the crown out to the second click position and set the time.

Pull the crown out to the second click position when the second hand is at the 12 o'clock position; the second hand will stop. Turn the crown to move the hands forward until the date changes to the next day. This indicates the time is set for PM. Move the hands forward to set the correct time. When setting the minute hand, advance it about 10 minutes past the correct time, then slowly move it back to the correct minute.

[Diagram description: Illustration showing the crown pulled out to the second click position, with the second hand stopped.]

5. Return the crown to its normal position in accordance with the time signal. The second hand will start moving immediately.

[Diagram description: Illustration showing the crown pushed back to the normal position.]

Tip: Telephone time signals are useful for precise second-hand setting.

6. Lock the crown again. (Refer to "Screw-Lock Crown" → Page 17)

Tips for More Accurate Time Setting:

Pay attention to the following points for more accurate time setting:

1. Before setting the time, wind the spring until the power reserve indicator shows a fully wound state.
2. If the watch has stopped, wait about 30 seconds after the second hand starts moving before pulling the crown out to the second click position.
3. Do not stop the second hand if the crown has been in the second click position for thirty minutes or longer. If the crown has been in the second click position and the second hand has been stopped for over 30 minutes, push the crown in to return it to the initial position. Wait until the second hand moves for at least 30 seconds, then reset the time.

Date Adjustment for Month-End

The date needs to be adjusted at the end of February and for 30-day months.

Example: Setting the date on the first day of the month following a 30-day month

If the watch shows "31" instead of "1": Pull the crown out to the first click position. Turn the crown counter-clockwise to set the date to "1", then return the crown to its normal position.

❗ WARNING

Return the screw-lock crown to its normal position. Do not change the date when the time displayed is between 9:00 PM and 1:00 AM. This may cause damage.

How to Read the Power Reserve Indicator

The power reserve indicator shows the state of the wound spring.

Before taking off the watch, check the power reserve indicator to ensure it has enough energy to keep running until you wear it next. If necessary, wind the spring. (To prevent the watch from stopping, wind the spring to build up additional energy, allowing the watch to run longer.)

[Diagram description: Illustration of the watch dial showing the power reserve indicator.]

How to Use the Rotating Bezel

The rotating bezel can be used to measure elapsed time since the start of an event.

1. At the start of an event for which you need to measure elapsed time (e.g., starting a dive), rotate the bezel so that the mark '▼' on the bezel aligns with the minute hand.

[Diagram description: Illustration showing the bezel being rotated so the '▼' mark aligns with the minute hand.]

Note: The rotating bezel is designed to rotate only counter-clockwise. Do not force it clockwise.

(Refer to "Unidirectional Rotating Bezel" → Page 29)

2. Observe the graduation on the rotating bezel that the minute hand points to. The graduation on the rotating bezel indicated by the minute hand corresponds to the elapsed time.

[Diagram description: Illustration showing the minute hand pointing to a graduation on the bezel, indicating elapsed time.]

Example: If you start a dive at 10:10. After 20 minutes, the minute hand points to the 20-minute mark on the bezel, indicating 20 minutes have passed.

[Diagram description: Illustration showing the bezel with the minute hand pointing to the 20-minute mark, indicating elapsed time.]

Unidirectional Rotating Bezel

Since the remaining air in a tank is based on the time elapsed since the start of a dive, the rotating bezel for diver's watches is designed to rotate only counter-clockwise. This prevents the watch from showing an elapsed time shorter than the actual time that has passed.

❗ WARNING

Always check the remaining air in your tank before diving. During a dive, use the elapsed time indicated by the rotating bezel solely as a reference.

Care and Maintenance

Daily Care

The watch requires careful daily care.

• Do not wash the watch while the crown is pulled out.
• Wipe off moisture, sweat, and dirt with a soft cloth.
• After diving in saltwater, rinse the watch thoroughly with fresh water and dry it completely. Do not pour tap water directly onto the watch. First, pour some water into a basin, then immerse the watch and rinse it.
• If your watch is classified as "not water-resistant" or "water-resistant for everyday use," do not rinse it. (Refer to "Water Resistance" → Page 14, "Operating Characteristics and Type" → Page 31)

Periodically Rotate the Crown

To prevent corrosion of the crown, rotate it periodically. This also applies to the screw-lock crown. (Refer to "Screw-Lock Crown" → Page 17)

Operating Characteristics and Type

The caliber and operating characteristics of the watch are indicated on the case back.

[Diagram description: Illustration of the watch case back showing labels for "Water Resistance" (Степень водонепроницаемости), "Resistance to Magnetic Fields" (Стойкость к воздействию магнитных полей), and "Case Number" (Номер корпуса). A SEIKO logo and "MADE IN JAPAN" are also visible.]

• Water Resistance
• Case Number: The number for identifying the watch type.
• Resistance to Magnetic Fields: See Page 33 and Page 34.

[Diagram description: Illustration of the watch case back with example markings.]

Lumibrite

If your watch has Lumibrite coating:

Lumibrite is a luminous paint that absorbs energy from sunlight and artificial light sources in a short time and emits light in the dark. For example, if exposed to light exceeding 500 lux for about 10 minutes, Lumibrite can emit light for 3 to 5 hours. However, as Lumibrite emits stored light energy, the brightness level gradually decreases over time. The duration of illumination may vary slightly depending on factors such as the brightness of the location where the watch was exposed to light and the distance from the light source to the watch.

• Generally, when moving from a bright area to a dark one, human eyes take some time to adapt to the darkness, making it difficult to distinguish objects at first. (Dark adaptation)
• Lumibrite is a luminous paint that stores and emits light. It is safe for people and the environment and does not contain toxic materials like radioactive substances.

Brightness Levels

Resistance to Magnetic Fields

When exposed to magnetism from nearby objects, the watch may temporarily run fast, slow down, or stop. Diver's watches have magnetic resistance equivalent to or exceeding Class 1 standards of the Japanese Industrial Standards (JIS).

⚠️ DANGER

Marking on Case Back

No Marking

Usage Conditions

Keep the watch more than 5 cm (2 inches) away from devices with magnetic fields. (JIS Level 1)

Marking Present

Keep the watch more than 1 cm (0.4 inches) away from devices with magnetic fields. (JIS Level 2)

If the watch becomes magnetized and its accuracy deteriorates beyond normal operating specifications, it requires demagnetization. If the watch loses accuracy due to magnetization, repair and demagnetization will be charged, even if it is within the warranty period.

Reason Magnetic Fields Affect Watches: The built-in regulation mechanism contains a magnet that can be affected by strong external magnetic fields.

Examples of Common Devices with Magnetic Fields That Can Affect Watches

[Diagram description: Icons representing a smartphone/tablet/mobile phone (speaker), a networked adapter, a bag with a magnetic clasp, a razor/kitchen appliance (speaker), a walkie-talkie, a magnetic necklace, and a magnetic pillow.]

If the watch becomes magnetized and its accuracy deteriorates beyond normal operating specifications, it requires demagnetization. If the watch loses accuracy due to magnetization, repair and demagnetization will be charged, even if it is within the warranty period.

Bracelet

The bracelet is in direct contact with the skin and can become dirty from sweat and dust. Therefore, without proper care, the bracelet may deteriorate faster, cause skin irritation, or stain clothing sleeves. For long-term use of the watch, thorough care is required.

Metal Bracelet

• If moisture, sweat, or dirt is left on the watch for extended periods, it can cause rust even on stainless steel bracelets.
• Lack of care can lead to rashes or yellowish/golden stains on shirt cuffs.
• Wipe off moisture, sweat, and dirt with a soft cloth as soon as possible.
• To remove dirt around bracelet gaps, first rinse the bracelet in water, then clean with a soft toothbrush. (Wrap the watch case in a plastic bag, etc., to prevent water from entering.) Wipe with a soft cloth.
• Some titanium bracelets use stainless steel pins for strength, which can rust. As rust progresses, the pins may protrude or fall out, potentially causing the bracelet to detach from the case or the clasp to become difficult to open. Protruding pins can cause injury. In such cases, stop wearing the watch and take it for repair.

Polyurethane Strap

• Polyurethane straps can fade in sunlight and may be damaged by solvents or high humidity. This is especially true for transparent, white, or light-colored straps, which can easily absorb other colors, leading to stains or discoloration.
• Wash off dirt with water and dry with a dry cloth. (Wrap the watch case in a plastic bag, etc., to prevent water from entering.)
• If the strap loses flexibility, replace it with a new one. Continued use of a stiff strap may eventually lead to cracks or brittleness.

Silicone Strap

• Due to the material's characteristics, this type of strap can easily get dirty, stained, or discolored. Wipe the strap with a damp cloth or tissue to remove dirt. Unlike straps made of other materials, cracks on silicone straps can gradually develop into tears. Avoid contact with sharp objects.

Notes on Irritation and Skin Allergies: Skin irritation from straps can occur due to factors such as allergies to metals or leather, friction, dust, or the strap itself.

Notes on Bracelet Length: Adjust the strap so that there is a small gap between it and your wrist, allowing for adequate air circulation. When wearing the watch, leave enough space to slip a finger between the bracelet and your wrist.

How to Adjust the Bracelet for Diving

If your watch's metal bracelet has a dive adjustment function, its length can be easily changed. This is very convenient when wearing the watch over a diving suit or winter clothing.

1. Lift the clasp so it is at approximately a 90° angle, then press it down further by about 20° and hold it lightly.

[Diagram description: Illustration showing the watch clasp being lifted and pressed down.]

Note: Be careful not to apply excessive force to the clasp. Some resistance may be felt, but only light force is needed.

2. Gently pull the bracelet from the 6 o'clock side of the watch along the curved line of the bracelet to extend the slider.

[Diagram description: Illustration showing the bracelet being pulled from the 6 o'clock side to extend the slider.]

Note: Only light force is required for this operation. Be careful not to pull the bracelet out forcefully. The slider can be extended by approximately 30 mm. Be careful not to extend the slider beyond this limit.

3. Press the button to lift the buckle and put the watch on your wrist.

[Diagram description: Illustration showing the buckle being released by pressing a button.]

4. First, close the buckle (4-1), then the clasp (4-2).

[Diagram description: Illustration showing the clasp and buckle being closed.]

5. While holding the bracelet on both sides, adjust the slider length so the bracelet fits comfortably around your wrist.

[Diagram description: Illustration showing the bracelet slider being adjusted for fit.]

Dive Extension Mechanism

If your watch's metal bracelet has a dive extension function, the bracelet length can be easily adjusted. This is very convenient when wearing the watch over a diving suit or winter clothing.

1. Lift the clasp.

[Diagram description: Illustration showing the clasp being lifted.]

2. Press the button to open the clasp.

[Diagram description: Illustration showing the clasp being opened by pressing a button.]

Note: After opening the clasp, press the clasp again to return it to its normal position.

3. Open the two-section folding part of the extension in the direction indicated by the arrow.

[Diagram description: Illustration showing the two-section folding part of the extension being opened.]

Note: Opening the folding part requires some force and will produce a click sound.

4. Slide the top cover of the extension in the direction indicated by the arrow, then pull upwards to fully extend the two-section folding part.

[Diagram description: Illustration showing the extension cover being slid and the folding part being pulled out.]

Note: To fold the extension, perform the above procedure in reverse. A click sound will be heard when the two-section folding part is fully folded, similar to when it is opened.

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

[Diagram description: Illustration showing the clasp and buckle being closed after putting on the watch.]

After-Sales Service

Notes on Warranty and Repair

• For repairs or maintenance, please contact the retail store where you purchased the watch or a SEIKO CUSTOMER SERVICE CENTER.
• A warranty certificate must be presented to receive repair services during the warranty period.
• Warranty terms are stated on the warranty certificate. Read and keep it carefully.
• After the warranty period expires, repair services are available on a paid basis, provided the malfunction can be corrected.

Replacement of Functional Parts

• Please note that if original parts are unavailable during repair, equivalent parts may be used, which may differ in appearance.

Inspection and Adjustment, Including Disassembly and Cleaning (Maintenance)

• To ensure optimal performance of the watch over a long period, it is recommended to have it inspected and adjusted, including disassembly and cleaning (maintenance), approximately every 3 to 4 years.
• The power transmission mechanism, which is responsible for the watch's operation, is constantly under stress. To keep this mechanism functioning properly, it is important to regularly clean parts, replace oil, adjust accuracy, check operation, and replace consumables. For extended watch life, the first maintenance after purchase is particularly important. Depending on usage conditions, the ability of mechanical parts to retain lubrication may decrease, leading to wear from oil contamination or causing the watch to run significantly slow or stop altogether. As gasket properties deteriorate over time, water resistance may decrease, allowing sweat and moisture to enter the mechanism. Inspection and adjustment, including disassembly and cleaning (maintenance), should be performed by the retail store where you purchased the watch, using "GENUINE SEIKO PARTS." When requesting service, also ask to replace the gasket and spring bar. Following inspection and adjustment, including disassembly and cleaning (maintenance), your watch's mechanism may be completely replaced.

❗ WARNING

Depending on the environment where the watch was used for diving, the movement of parts or internal components may be affected, or the case or bracelet may be damaged. We recommend regular servicing of the watch every 3 to 4 years.

Troubleshooting

If you encounter a problem not listed above, consult the retail store where you purchased the watch.

Technical Specifications

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