SEIKO 64R6, 21M Instruction Manual

6R64 JSY6R641-A2102

INSTRUCTIONSMECHANICAL WATCH

M-21

6R64

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https://www.seikowatches.com/

Thank you very much for choosing a SEIKO watch.

How to use the rotating bezel with 24-hour scale (For models with rotating bezel having 24-hour scale)

How to use the compass (Only for models with the compass bezel (ring))

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.

CONTENTS

1 HOW TO USE

Handling cautions ............................................ 4

Mechanical watch characteristics

(Hand-wound, auto-wound) ............................. 8

Names of the parts and their functions ............ 9

Crown ............................................................ 10

How to wind the mainspring .......................... 11

Power reserve indicator ................................. 13

How to read the power reserve indicator ... 14

How to set the time and date ......................... 15

How to set the time and date ..................... 15

Date setting ............................................... 18

Date adjustment at the end of the month ... 19

How to use the 24-hour hand ..................... 21

Time difference adjustment function ............. 23

How to use the time difference adjustment

function ...................................................... 23

List of time zone differences in major

regions of the world ................................... 25

............................................................. 27

In the case of 24-hour hand being set to

24 hours of the hour and minute hands ...... 27

In the case of 24-hour hand being set to

different time zone ..................................... 29

....................................... 31

Using the 24-hour hand ............................. 31

Using the hour hand ................................... 33

2 TO PRESERVE THE QUALITY OF YOUR

WATCH

Daily care ...................................................... 35

Performance and type ................................... 36

Lumibrite ....................................................... 37

Water resistant performance ......................... 38

Magnetic resistant performance .................... 39

Band .............................................................. 41

How to use tri-fold type clasp for leather band

(Special clasps) ............................................. 44

How to use an easy adjust type clasp ............ 50

After sales service ......................................... 53

Accuracy of mechanical watches .................. 55

Troubleshooting ............................................ 57

Specifications ................................................ 59

Handling cautions

b 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.

HOW TO USE

Mechanical watch characteristics (Hand-wound, auto-wound)

HOW TO USE

Please note that there is a risk of minor injury or material damage if the following safety

b CAUTION

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

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. ○ 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 they 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.

○ Places affected by strong vibrations ○ Places of high humidity ○ Dusty places

b WARNING

Do not use the watch in scuba diving or saturation diving.

The various tightened inspections under simulated harsh environment, which are usually required for watches designed for scuba diving or saturation diving, have not been conducted on the water resistant watch with the BAR (barometric pressure) display. For diving, use watches specifically designed for diving.

b CAUTION

Do not pour running water directly from faucet.

The water pressure of tap water from a faucet is high enough to degrade the water resistant performance of a water resistant watch for everyday life.

HOW TO USE

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.

b CAUTION

• This is a mechanical watch powered by a spring.

• To use it from a stopped state, turn the crown 20 turns by hand to wind up the spring before starting the watch.

• Although the accuracy of quartz watches is measured in differences over months or years, in mechanical watches it is measured in differences per day (i.e., the amount the watch speeds up or slows down in a single day).

• Additionally, mechanical watches are subtly affected by the conditions in which they are used (e.g., duration worn, temperature, arm movement, the amount wound, etc.) ; thus, the amount of error is not constant.

• When affected by a strong magnetism from outside, a mechanical watch may lose/gain time temporarily. The parts of the watch may become magnetized depending on the extent of the effect. In such a case, consult the retailer from whom the watch was purchased since the watch requires repair including demagnetizing.

HOW TO USE

While pressing the crown in, turn it in the direction indicated by the arrow.

HOW TO USE

Names of the parts and their functions

1 2

2 3 4

5 6 7

5 6

* The position and design of the display may vary depending on the model. * The direction of the power reserve indicator is different depending on the model.

Minute hand

Hour hand

Power reserve indicator

Seconds hand

Date hand

24-hour hand

Crown

• Normal position (not locked): Wind up the watch (hand-wound)

• First click position: Time difference adjustment/Date setting

• Second click position: Time setting

Crown

There are two types of crowns, a normal crown and a screw down crown. Please check the type of the crown of your watch.

The crown turns.

The crown

does not

turn.

* By locking the crown by screw, a screw down crown can prevent malfunction and increase water resistance. * Be careful not to screw the crown in by force as it may damage the slots of the crown.

Unlock the crown before operating it.

Unscrew

Pull out the crown and operate it.

Normal crown

Screw down crown

After operating the crown, lock it.

Rotate while pressing the crown in.

HOW TO USE

How to wind the mainspring

• This is an automatic mechanical watch with a manual winding mechanism.

• When the watch is worn on the wrist, the mainspring is wound automatically through normal wrist movement. The watch can also be wound up by turning the crown.

• To start the watch after it stops completely, wind it up either by turning the crown or swinging it from side to side until the seconds hand starts moving. Then, set the time and date before putting the watch on the wrist. To wind up the watch, turn the crown clockwise slowly. The watch cannot be wound by turning the crown counterclockwise. In this way, the watch can be wound up fully. Furthermore, turning the crown further will not break the spring.

* For the watch with screw down crown, please unlock the crown before operating it and be sure to lock the crown

after operating it.

• Wind the mainspring until the power reserve indicator shows a fully-wound state. Once the watch is wound up fully, it operates for about 45 hours.

* To check the winding state of the mainspring, refer to “Power reserve indicator” → P.13.

* If the watch is used without being wound up fully, gain or loss of time may result. To avoid this, wear the watch for

more than 10 hours a day. If the watch is used without being worn on the wrist, be sure to wind it up fully every day at a fixed time.

* If you use a watch that has stopped with the mainspring unwound, winding the mainspring with the crown will not

start the watch immediately. That is because the mainspring torque or force is low at the beginning of its winding due to the characteristics of mechanical watches. The seconds hand will start to move when a certain degree of torque is reached after the mainspring has been wound up. However, swinging the watch from side to side to forcibly turn the balance can start the watch sooner.

HOW TO USE

• The power reserve indicator lets you know the winding state of the mainspring.

• Before removing the watch from your wrist, observe the power reserve indicator to check if the watch has stored enough power to keep running until the next time you wear it. If necessary, wind the mainspring. (To prevent the watch from stopping, wind the mainspring to store the excess power that will allow the watch to run for extra time.)

Power reserve indicator

■ How to read the power reserve indicator

• As shown in the diagram below, when the indicator is pointing near 45 or F on the scale, it is fully wound. As the mainspring unwinds, the indicator will move toward 0 or E.

* The accuracy of a mechanical watch is affected by the winding amount of the mainspring. If the watch is used

for a long time when the winding amount is 20 hours or less, stable accuracy may not be obtained. Therefore, it is recommended that the winding amount be between 20 hours and full winding when you use the watch.

* Once the mainspring is fully wound, it will slip if you wind it further, so there is no chance of the mainspring

breaking even if it is over wound.

* The indicator may move beyond 0 or E, but this is not a malfunction.

The Power Reserve Indicator

HOW TO USE

Power reserve indicator

* The continuous operating time of the watch may vary depending on the conditions of your usage (such as the

number of hours you wear the watch or the extent of your movement while wearing it).

* In a case where you wear the watch for a short period of time each day, observe the power reserve indicator to

check the level of the remaining power.

HOW TO USE

How to set the time and date

If necessary, manually wind the mainspring.

■ 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”

→ P.19.

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

Make sure that the watch is working.

* To carry out the procedure, please make sure that the watch is in working state. Please wind the mainspring

when the watch is not working.

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.

The winding state of the mainspring

The number of hours the watch can run

* Designs vary depending on the model. Refer to the above diagram to read the approximate continuous operating

time.

For advancing the hands clockwise,

turn the crown in the direction of the

Fully wound Half wound Unwound

Approximately 45 hours Approximately 20 hours The watch either stops or is

running down.

arrow and 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 24hour hand first.

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.

Set it in such a way that the 24-hour hand and the minute hand advance clockwise

HOW TO USE

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