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Maintenance of Mechanical Watch

Mechanical watches work based on the power of the spring.
The watch is operated using the power of a unwinding spring that is wound manually or automatically. By maintaining the winding of the spring, accuracy is preserved.

The spring is wound by wrist movement.
In a mechanical watch, the necessary time to wind the spring sufficiently is 8 to 10 hours when the watch is worn on the wrist.

When the spring is unwound, the watch stops but this is not a failure.
Even if the spring is wound all the way, the watch stops in case you don not wind the spring for about two days manually or automatically.

How to wind the watch
When the hands of the watch are not moving, swing the watch 20 to 30 times before using.
*About the hand-winding mechanism, you can wind the mainspring by turning the crown.

Avoid setting the date when the watch hand is between 8:00pm ~ 5:00am, since the watch is in a period of time where the date rolls over to the next day.
During this time period, the watch is preparing for the date change. The gear engages slowly to change the date. Therefore, if you attempt to set the date during this time period, excess force is applied to the gear, which could cause the fail.
*Note: The period of time where the date rolls over to the next day differs depending on the caliber used. For details on the watch, refer to the instruction manual.

Mechanical watch accuracy
Mechanical watches have an error of 30 ~ 60 seconds per day. When determining the condition of the mechanical watch regarding whether it is running fast or slow, check the average error of one week, not how many seconds in one day.

Notes on daily use

1. Gaskets are vulnerable to organic solvents and chemicals, thus be sure to keep the watch away from them (shampoo, soap, cosmetics, etc.).

2. If the watch contacts with seawater, clean well with fresh water.

3. There is some humidity inside the watch thus when the outside temperature is lower than inside the watch, the inside of the glass may fog up temporarily. This is not a failure. But if it keeps fogging and does not clean up or water gets inside the watch, repair is required.

4. Be careful about water entering the watch inside from the crown. Keep the crown pushed in at all the time (in the normal position) while using the watch. Do not operate the buttons and crown when the watch is under water or being worn in wet conditions.

5. Even if the watch has a diver specification, do not take a bath while wearing it. Make sure to take off the watch before taking a bath. Also, using shampoo or soap accelerates deterioration of gasket.