7 Overhaul of a mechanical watch To use the watch for a long time in good condition, it is recommended that you allow maintenance once every 2 or 3 years. How to wind the watch When the hands of the watch are not moving, swing the watch 30 to 50 times before using. *About the hand-winding mechanism, you can wind the mainspring by turning the crown. Mechanical watch accuracy Mechanical watches have an error of 30 seconds or less per day. Note: Date and month differences depend on the caliber. Mechanical watch Quartz watch 1 day 30 seconds or less 1 month 30 seconds or less Check the average error over one week to find out the accuracy of the mechanical watch 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. Avoid setting the date when the watch hand is between 8:30pm ~ 4:00am, 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.
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