SEIKO Mechanical Watch Instructions

1. Usage

Handling Precautions

WARNING

Serious injury may occur if the following safety instructions are not strictly followed.

Immediately stop wearing the watch if:

• The watch case or bracelet shows corrosion, etc.
• The bracelet lugs are protruding.

Consult the retailer where the watch was purchased or the Customer Service Center immediately.

Keep the watch and its parts out of reach of babies and children. Take necessary precautions to prevent a baby or child from accidentally swallowing a part. If a baby or child swallows a battery or part, consult a doctor immediately as it can endanger their health.

CAUTION

Minor injuries or material damage may occur if the following safety instructions are not strictly followed.

Avoid wearing or storing the watch in the following locations:

• Areas where volatile agents (cosmetics like solvents, insecticides, paint thinners, etc.) are sprayed.
• Areas where the temperature drops below 5°C (41°F) or rises above 35°C (95°F) for extended periods.
• Areas with strong magnetic fields or static electricity.
• Areas with strong vibrations.
• Very humid or dusty areas.

If you notice signs of allergy or skin irritation, stop wearing the watch immediately and consult a specialist (dermatologist or allergist).

Other Cautions

• Adjusting the length of a metal bracelet requires specialized knowledge and expertise. Contact the retailer where the watch was purchased. Attempting to adjust the metal bracelet yourself may result in injury to your hands or fingers, or loss of bracelet parts.
• Do not attempt to disassemble or modify the watch.
• Keep the watch out of reach of babies and children. Take precautions to prevent injury, redness, or allergic itching that may occur from contact with the watch.
• If your watch is a pocket or pendant type, its chain or strap may damage your clothing or scratch your hand, neck, or other body parts.

WARNING

Do not use the watch for scuba diving or saturation diving. The watch with barometric pressure display has not undergone the rigorous controls required for watches designed for scuba diving or saturation diving. Only use watches designed for diving for diving activities.

CAUTION

Do not pass the watch directly under running tap water. Tap water pressure is sufficient to reduce the water resistance performance of a watch designed for daily life.

CAUTION

Do not turn or pull the crown when the watch is wet. Water may infiltrate the watch. If the inside of the glass is fogged or water droplets appear inside the watch, its water resistance has been compromised. Consult the retailer where the watch was purchased or the Customer Service Center immediately.

Quickly wipe off any moisture, sweat, or dirt on the watch. Be aware that the water resistance performance of a water-resistant watch may decrease due to deterioration of the adhesive on the glass or gasket, or rust formation on stainless steel. Remove the watch before bathing or entering a sauna. Steam, soap, or certain components from hot springs can accelerate the degradation of the watch's water resistance performance.

Mechanical Watch Characteristics (Manual Winding, Automatic Winding)

• This is a mechanical watch powered by a mainspring.
• To start a stopped watch, turn the crown 20 times manually to wind the mainspring before starting the watch.
• While quartz watch accuracy is measured in differences over months or years, mechanical watch accuracy is measured in daily differences (how much the watch gains or loses per day).
• Mechanical watches are subtly affected by usage conditions (e.g., duration of wear, temperature, arm movement, mainspring winding status, etc.), so the error amount is not constant.
• When exposed to a strong external magnetic field, the mechanical watch may temporarily gain or lose time. The watch components may become magnetized depending on the extent of the effect. In such cases, contact the retailer where the watch was purchased, as it will need to be repaired, including demagnetization.

Parts and Functions

Model 4R35

The dial features:

• 1. Minute hand
• 2. Hour hand
• 3. Second hand
• 4. Date display
• 5. Crown

Crown Positions:

• Normal position (unlocked): Wind the watch (manual winding).
• 1st click position: Set the date.
• 2nd click position: Set the hour.

* The position and appearance of the display may vary depending on the watch model.

Model 4R36

The dial features:

• 1. Minute hand
• 2. Hour hand
• 3. Second hand
• 4. Date and Day of the week display
• 5. Crown

Crown Positions:

• Normal position (unlocked): Wind the watch (manual winding).
• 1st click position: Set the date and day of the week.
• 2nd click position: Set the hour.

* The position and appearance of the display may vary depending on the watch model.

Model 4R37

The dial features:

• 1. 24-hour hand
• 2. Hour hand
• 3. Second hand
• 4. Minute hand
• 5. Date display
• 6. Crown

Crown Positions:

• Normal position (unlocked): Wind the watch (manual winding).
• 1st click position: Set the date.
• 2nd click position: Set the hour.

* The position and appearance of the display may vary depending on the watch model.

Model 4R38 / 4R71 / 4R72

The dial features:

• 1. Minute hand
• 2. Hour hand
• 3. Second hand
• 4. Crown

Crown Positions:

• Normal position (unlocked): Wind the watch (manual winding).
• 1st click position: Set the hour.

* The position and appearance of the display may vary depending on the watch model.

Model 4R39

The dial features:

• 1. 24-hour hand
• 2. Hour hand
• 3. Second hand
• 4. Minute hand
• 5. Crown

Crown Positions:

• Normal position (unlocked): Wind the watch (manual winding).
• 1st click position: Set the hour.

* The position and appearance of the display may vary depending on the watch model.

Crown Operation

There are two types of crowns: normal and screw-down. Check your watch's crown type.

Normal Crown: Pull out the crown to operate it.

Screw-down Crown: Unlock the crown before use by unscrewing it. After operation, screw it back in to lock it. Turn while pushing the crown in.

Locking the screw-down crown prevents malfunction and enhances water resistance. Do not force the screw-down crown when locking it, as this may damage the crown's splines.

Winding the Mainspring

This is a mechanical watch with manual winding capability. When worn on the wrist, the mainspring is automatically wound by normal wrist movement. The watch can also be wound by turning the crown.

To start a completely stopped watch, wind it by turning the crown or by oscillating it side-to-side until the second hand starts moving. Then, set the time and date before wearing the watch. To wind the watch, slowly turn the crown clockwise. The watch cannot be wound by turning the crown counter-clockwise. The watch can be fully wound this way; turning the crown further will not break the spring.

For watches with a screw-down crown, unlock it before use and ensure it is locked after use.

Once fully wound, the watch will operate for approximately 41 hours.

* If the watch is used without being fully wound, it may gain or lose time. To prevent this, wear the watch for more than 10 hours a day. If the watch is not worn on the wrist, ensure it is fully wound every day at a precise time.

* If using a watch that has stopped with the mainspring unwound, turning the crown to wind the spring will not start the watch immediately. This is because the mainspring's torque (force) is weak at the start of winding due to the characteristics of mechanical watches. The second hand will start moving when a certain torque is reached after the mainspring has been wound. However, oscillating the watch side-to-side to force it to turn may start the watch sooner.

Setting the Time and Date (4R35)

The watch has a date function and is designed so that the date changes every 24 hours. The date changes at midnight. If the AM/PM is not set correctly, the date will change at noon.

CAUTION

Do not set the date between 9 PM and 1 AM. Modifying the date during this period may cause problems such as the date not changing the next day.

1. Pull the crown to the first click.
2. Turn the crown to set the correct date. Turn it until the previous day's date appears. (e.g., To display "6", set it to "5".) Turn the crown counter-clockwise to set the date.
3. Pull the crown to the second click and set the time. Pull the crown to the second click when the second hand points to the 12 o'clock position; the second hand stops. Turn the crown to advance the hands until the date changes to the next day. The time is now set for the morning period. Advance the hands to set the correct time.
4. Push the crown back to the normal position according to a time signal. The second hand will start moving immediately. Using a telephone time signal is useful for setting the second hand accurately.

CAUTION

The mechanism of mechanical watches differs from that of quartz watches. When setting the time, be sure to move the minute hand back slightly, then advance it to the exact time.

Adjusting the Date at the End of the Month

It is necessary to adjust the date at the end of February and for months with 30 days.

Example: To adjust the date to the morning of the first day of a month following a 30-day month:

If the watch displays "31" instead of "1", pull the crown to the first click. Turn the crown counter-clockwise to set the date to "1", then push the crown back to the normal position.

CAUTION

Avoid modifying the date when the watch is operating between 9 PM and 1 AM. This could cause malfunctions.

Setting the Time, Date, and Day of the Week (4R36)

The watch has a date and day-of-the-week function designed so that the date and day of the week change every 24 hours. The date changes at midnight, and the day of the week changes at 4 AM. If AM/PM is not set correctly, the date will change at noon, and the day of the week will change at 4 PM.

CAUTION

Do not set the date or day of the week between 9 PM and 4 AM. Modifying the date or day of the week during this period may cause problems such as the date or day of the week not changing the next day, or may cause damage.

1. Pull the crown to the first click.
2. The date and day of the week can be set by turning the crown. Turn it until the previous date/day of the week appears. (e.g., To display "6", set it to "5".) Turn the crown counter-clockwise to set the date, then clockwise to set the day of the week. For models with bilingual day-of-the-week displays, select your preferred language when setting the day of the week.
3. Pull the crown to the second click and set the time. Pull the crown to the second click when the second hand points to the 12 o'clock position; the second hand stops. Turn the crown to advance the hands until the date changes to the next day. The time is now set for the morning period. Advance the hands to set the correct time.
4. Push the crown back to the normal position according to a time signal. The second hand will start moving immediately.

CAUTION

The mechanism of mechanical watches differs from that of quartz watches. When setting the time, be sure to move the minute hand back slightly, then advance it to the exact time.

Adjusting the Date at the End of the Month

It is necessary to adjust the date at the end of February and for months with 30 days.

Example: To adjust the date to the morning of the first day of a month following a 30-day month:

If the watch displays "31" instead of "1", pull the crown to the first click. Turn the crown counter-clockwise to set the date to "1", then push the crown back to the normal position.

CAUTION

Avoid modifying the date when the watch is operating between 9 PM and 4 AM. This could cause malfunctions.

Setting the Time, 24-Hour Hand, and Date (4R37)

The watch has a date function and is designed so that the date changes every 24 hours. It also has a 24-hour hand to check if the displayed time is AM or PM. The date changes at midnight. Therefore, if AM/PM is not indicated correctly, the date will change at noon. Ensure the AM/PM periods are correctly indicated using the 24-hour hand.

CAUTION

Do not set the date between 9 PM and 1 AM. Modifying the date during this period may cause problems such as the date not changing the next day.

1. Pull the crown to the first click.
2. Turn the crown to set the correct date. Turn the crown counter-clockwise to set the date.
3. Pull the crown to the second click and set the time. Pull the crown to the second click when the second hand points to the 12 o'clock position; the second hand stops. Turn the crown to set the exact time. As the hour hand and the 24-hour hand move together, check the AM/PM setting with the 24-hour hand when setting the current time.
4. Push the crown back to the normal position according to a time signal. The second hand will start moving immediately.

CAUTION

The mechanism of mechanical watches differs from that of quartz watches. When setting the time, be sure to move the minute hand back slightly, then advance it to the exact time.

Adjusting the Date at the End of the Month

It is necessary to adjust the date at the end of February and for months with 30 days.

Example: To adjust the date to the morning of the first day of a month following a 30-day month:

If the watch displays "31" instead of "1", pull the crown to the first click. Turn the crown counter-clockwise to set the date to "1", then push the crown back to the normal position.

CAUTION

Avoid modifying the date when the watch is operating between 9 PM and 1 AM. This could cause malfunctions.

Setting the Time (4R38 / 4R71 / 4R72)

1. Pull the crown to the first click and set the time.
2. Push the crown back to the normal position according to a time signal. The second hand will start moving immediately.

CAUTION

The mechanism of mechanical watches differs from that of quartz watches. When setting the time, be sure to move the minute hand back slightly, then advance it to the exact time.

Setting the Time and 24-Hour Hand (4R39)

1. Pull the crown to the first click and set the time.
2. Push the crown back to the normal position according to a time signal. The second hand will start moving immediately.

CAUTION

The mechanism of mechanical watches differs from that of quartz watches. When setting the time, be sure to move the minute hand back slightly, then advance it to the exact time.

Using the Simplified World Time Function (For models with simplified world time function only)

By using the names of major world cities on the rotating bezel and the 24-hour display on the dials, you can read the approximate time in each city. This is a simplified world time function and should not be used when precision is essential.

Example: When you are in Tokyo and want to know the time in Paris:

1. Check the current time in Tokyo (e.g., 2:00 PM).
2. Set the rotating bezel to align "TOKYO" with the 14:00 indicator.
3. Check the alignment of "PARIS" on the rotating bezel. (In this case, it aligns with 6, indicating 6:00 AM in Paris).

You can use this method to read the time in other cities. For example, you can read 9:00 PM in Los Angeles.

Using the Compass (For models with a compass bezel only)

Use the compass in locations where the sun is visible or its position is known. If daylight saving time is in effect, set your watch one hour behind the current time before using the rotating compass bezel. The compass is designed to provide only an approximate indication of directions and should not be used where accuracy is required.

Using the Compass Bezel (Bag)

In the Northern Hemisphere:

1. Hold the watch face flat and point the hour hand towards the sun.
2. Align the "S" (South) on the rotating compass bezel with the midpoint of the arc between the 12 o'clock marker and the hour hand. The direction marks on the rotating bezel indicate the corresponding directions.

In the Southern Hemisphere:

1. Hold the watch face flat and point the 12 o'clock marker towards the sun.
2. Align the "N" (North) on the rotating compass bezel with the midpoint of the arc between the 12 o'clock marker and the hour hand. The direction marks on the rotating bezel indicate the corresponding directions.

* "N" may be a different mark. For a "bag" type, it may have a crown or other operational elements.

Emergency Signal Codes (For models with emergency signal codes only)

Nine important emergency signals transmitted from ground to aircraft are displayed on the dial.

• Y: YES
• N: NO
• LL: ALL WELL
• JL: NOT UNDERSTOOD
• K: INDICATE DIRECTION TO PROCEED
• X: UNABLE TO PROCEED
• I: REQUIRE DOCTOR
• II: REQUIRE MEDICAL SUPPLIES
• F: REQUIRE FOOD AND WATER

General Use: In distress, these signs should be drawn on the ground for rescue craft/parties. The panel should be at least 10 meters wide, with characters oriented north-south. On snow, the panel should be dug as a trench or raised to be legible by shadow. Clothing and equipment should be used if physical strength is insufficient. Grass, trees, or stones should be used if available. During rescue operations, aircraft may use loudspeakers and communication tubes to contact people on the ground, but the person in distress may have difficulty responding. However, knowing these response methods can aid in a successful rescue.

2. Preserving Watch Quality

Daily Maintenance

This watch requires careful daily maintenance.

• Do not expose the watch to water when the crown is unlocked.
• Wipe off moisture, sweat, and dirt with a soft cloth.
• If the watch has been exposed to seawater, rinse it with fresh water and dry it thoroughly. Do not pass the watch directly under running tap water. First, put some water in a bowl, then immerse the watch to wash it.
• If your watch is marked "Non-water-resistant" or "Water-resistant for daily life," do not wash it.
• Refer to "Performance and Type" (P. 39) and "Water Resistance" (P. 41).

Regularly Turn the Crown

• Regularly turn the crown to prevent corrosion.
• This applies to screw-down crowns as well. Refer to "Crown" (P. 14).

Lumibrite

If your watch contains Lumibrite:

Lumibrite is a luminous coating that quickly absorbs natural and artificial light energy, stores it, and emits it in the dark. For example, after about ten minutes of exposure to light exceeding 500 lux, Lumibrite can emit light for 3 to 5 hours. However, Lumibrite only emits stored light, and its brightness decreases over time. The duration of light emission also depends on factors such as the brightness of the location where the watch was exposed to light and the distance between the light source and the watch.

* Generally, moving from a bright to a dark place requires a period of adaptation for the human eye, making objects difficult to see initially (dark adaptation).

Lumibrite is a luminous coating that stores and emits light. It is harmless to human health and the environment and does not contain toxic materials such as radioactive substances.

Light Level Conditions

Performance and Type

The watch's performance and caliber are indicated on the case back.

Water Resistance: Refer to P. 41.

Case Number: The number used to identify the watch type.

Magnetic Resistance: Refer to P. 42 and P. 43.

* The illustration above is an example and may differ from your watch.

Water Resistance Performance

Refer to the table below for your watch's water resistance performance before use.

Magnetic Resistance

When exposed to ambient magnetism, a watch may temporarily gain or lose time, or stop functioning.

If the watch becomes magnetized and its accuracy deteriorates beyond specified proportions under normal usage conditions, it needs to be demagnetized. Demagnetization and accuracy readjustment will be charged, even if it occurs during the warranty period.

Why a Watch is Affected by Magnetism: The integrated balance spring can be influenced by a strong external magnetic field.

Examples of Common Magnetic Products Affecting Watches

• Smartphone, tablet terminal (speaker, cover magnet)
• AC adapter
• Bag (with magnetic clasp)
• Alternating current shaver
• Magnetic cooking appliance
• Portable radio (speaker)
• Magnetic necklace
• Magnetic pillow

Bracelet

The bracelet is in direct contact with the skin and gets dirty from sweat and dust. Insufficient maintenance can degrade the bracelet, cause skin irritation, or stain shirt cuffs. To prolong your watch's lifespan, ensure the bracelet is kept clean.

Metal Bracelet

• Prolonged contact with moisture, sweat, or dirt can cause rust, even on stainless steel bracelets.
• Lack of maintenance can cause redness or yellow/gold stains on shirt cuffs.
• Immediately wipe off moisture, sweat, or dirt with a soft cloth.
• To clean dirt around bracelet links, wipe with water and then brush with a soft toothbrush. (Avoid wetting the watch case by wrapping it in plastic, etc.) Clean with a soft cloth.
• Some titanium bracelets use extremely strong stainless steel pins, which can rust. If rust progresses, the pins may dislodge or fall off, the case may detach from the bracelet, or the clasp may not open. If a pin dislodges, you risk injury. In such cases, stop wearing the watch and have it repaired.

Leather Bracelet

• Under the effect of moisture, sweat, and direct sunlight, leather bracelets tend to discolor and deteriorate.
• Wipe off moisture and sweat as quickly as possible with a dry cloth. Do not expose the watch to direct sunlight for prolonged periods.
• Take special care with light-colored bracelets, as dirt will be more visible.
• Avoid wearing leather bracelets (except for Aqua Free bracelets) when bathing, swimming, or working with water, even if the watch itself is water-resistant for daily use (10 bar/20 bar water resistance).

Polyurethane Bracelet

• Polyurethane bracelets are susceptible to discoloration from light and can be deteriorated by solvents or atmospheric moisture.
• Translucent, white, or pale-colored bracelets, in particular, tend to absorb other colors, leading to stains or discoloration.
• Wash them with water before wiping with a dry cloth. (Avoid wetting the watch case by wrapping it in plastic, etc.)
• If the bracelet becomes stiff, have it replaced. Continuing to wear it in this state may cause the bracelet to crack and become brittle.

Silicone Bracelet

• Due to the material's characteristics, silicone bracelets get dirty easily and may develop stains or discoloration over time. Remove dirt with a damp cloth or wipe.
• Unlike bracelets made of other materials, cracks can lead to the bracelet breaking. Be careful not to damage the bracelet with a sharp tool.

Notes on Skin Irritation and Allergies

Skin irritation from bracelet contact can have multiple causes, including allergies to metals or leather, or a skin reaction to friction from dirt or the bracelet.

Notes on Bracelet Length

The bracelet should be loose enough not to stick to the wrist and allow for good air circulation. You should be able to pass a finger between the watch and your wrist.

How to Use a Deployant Clasp for Leather Bracelets (Special Clasps)

There are 3 types of unique clasps, described below. If the clasp of the watch you purchased matches one of these types, please refer to the instructions.

• Type A → P. 48
• Type B → P. 49
• Type C → P. 50

Type A Clasp Operation

1. Lift the clasp to release the buckle.
2. Open the flap.
3. Remove the pin from the adjustment hole. Slide the bracelet left and right and reinsert the pin into the adjustment hole at the appropriate length.
4. Close the flap. Do not force the flap.

* To buckle the clasp, insert the end of the bracelet into the movable and fixed buckles, then lock the clasp securely.

Type B Clasp Operation

1. By pressing the push buttons on both sides of the flap, lift it to open the clasp.
2. Remove the pin from the adjustment hole. Slide the bracelet left and right and reinsert the pin into the adjustment hole at the appropriate length. Push the buckle and lock the clasp.

Type C Clasp Operation

1. By pressing the push buttons on both sides of the flap, pull the bracelet out of the fixed and movable bridges, then open the clasp.
2. Insert the end of the bracelet between the movable and fixed bridges, and secure the clasp by pressing the buckle frame.
3. Remove the pin from the bracelet's adjustment hole. Slide the bracelet to adjust its length and find the appropriate hole to insert the pin.
4. Close the flap.

How to Adjust Bracelet Length

1. By pressing the push buttons on both sides of the flap, pull the bracelet out of the fixed and movable bridges, then open the clasp.
2. Press the push buttons again to release the flap.

How to Use an Easy Adjustment Clasp

Some bracelets are equipped with an easy adjustment clasp that allows for precise adjustment of the bracelet length.

If your watch's clasp is as shown below, follow these instructions.

* The bracelet can be extended by approximately 5 mm. This is useful if you feel the bracelet is too tight or uncomfortable for any reason.

How to Wear the Bracelet (Opening and Closing the Clasp)

1. Lightly press the push buttons to open the clasp. Note that pressing too hard (excessively) on the push buttons activates the micro-adjustment mechanism, extending the bracelet.
2. Secure the clasp by pressing the buckle frame.

After-Sales Service

Remarks on Warranty and Repairs

• For any repair or servicing, contact the retailer where the watch was purchased or the Customer Service Center.
• During the warranty period, present the warranty certificate to receive repair services. The warranty coverage is indicated on the certificate. Read it carefully and keep it.
• For repair services after the warranty period expires, if the watch's functions can be restored through our repair work, we will perform them upon your request and charge accordingly.

Replacement with Functional Parts

Please note that if parts are unavailable, replacement parts may be different in appearance from the originals.

Periodic Servicing (Overhaul)

It is recommended to have periodic checks and adjustments through disassembly and cleaning (overhaul) every 2 to 3 years to maintain the watch's optimal performance long-term. The power transmission mechanism of this watch is constantly subjected to forces. To ensure this mechanism functions correctly at all times, it is important to wash parts, change oil, adjust accuracy, check functions, and regularly replace consumable parts. The first overhaul after purchase is particularly important for long-term use. Depending on usage conditions, mechanical parts may become less lubricated; abrasion of parts due to oil contamination can cause the watch to gain or lose time considerably, or stop completely. As parts like gaskets deteriorate, water resistance performance may decrease due to moisture and sweat infiltration. Inspection and adjustment through disassembly and cleaning (overhaul) should be performed by the retailer where the watch was purchased, using SEIKO GENUINE PARTS. Also request replacement of the waterproof gasket and spring bars at the same time. Your watch's overhaul (including disassembly and cleaning) may require replacement of its movement's power transmission mechanism.

Mechanical Watch Accuracy

Mechanical watch accuracy is indicated by "daily rate." The accuracy of mechanical watches may not fall within the specified time interval because the gain/loss of time varies depending on its position, which depends on usage conditions such as how long the watch is worn on the wrist, arm movement, whether the mainspring is fully wound or not, etc.

The gain/loss of time for mechanical watches is not measured by a daily rate but by an average weekly rate.

Variation in Accuracy Due to Temperature

The parts that ensure the accuracy of mechanical watches are made of metal. Metals expand or contract with temperature changes due to their characteristics, affecting watch accuracy. Mechanical watches tend to lose time at high temperatures and gain time at low temperatures.

Mainspring Tension and Accuracy

To improve accuracy, it is important to regularly supply energy to the balance wheel that controls the speed of the gears. The driving force of the mainspring that powers mechanical watches varies from when it is fully wound to just before it unwinds. As the mainspring unwinds, its force weakens.

Automatic winding watches can achieve relatively stable accuracy if worn frequently on the wrist. For manual winding mechanical watches, the same result can be achieved by winding the mainspring every day at a fixed time.

Effect of Magnetism

When exposed to a strong external magnetic field, the mechanical watch may temporarily gain or lose time. The watch components may become magnetized depending on the extent of the effect. In such cases, contact the retailer where the watch was purchased, as it needs to be repaired, including demagnetization.

Troubleshooting

* For troubleshooting other than the issues listed above, contact the retailer where the watch was purchased.

Characteristics

* The accuracy indicated above is adjusted at the factory.

* Due to the characteristics of mechanical watches, actual daily rate may not fall within the specified hourly accuracy range depending on usage conditions, such as the duration the watch is worn on the wrist, temperature, arm movement, and whether the mainspring motor is fully wound or not, etc.