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A mechanical watch automatically recharges itself when worn by converting the wearer's arm and wrist movements into energy. Movement of the watch causes the main spring of the watch to excite. This spring is the source of energy.
The 8L35 Seiko calibre with date indication is a mechanical calibre. The watch automatically recharges itself during wear by converting the wearer's arm and wrist movements into energy. Movement of the watch causes the main spring of the watch to be wound. This spring is the source of energy. Hand-winding is also possible. When fully charged, the watch has an energy reserve of approx. 50 hours. The ticking number of this machine is 28,800 per hour and the watch has 26 jewels. The 8L calibre is manufactured entirely in-house.
A mechanical watch works without a battery and has a larger deviation than Quartz, Kinetic or Spring Drive watches. For example: -15/+25sec per day.