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A mechanical watch automatically charges itself when worn by converting the wearer's arm and wrist movements into energy. Movement of the watch causes excitation of the main spring of the watch. This spring is the source of energy.
The 6R35 Seiko caliber with date display is a mechanical caliber. The watch automatically recharges itself while worn 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 up. This spring is the energy source. Hand winding of the watch is also possible. When fully charged, the watch has a power reserve of no less than about 70 hours. The tick rate of this automatic is 21,600 per hour and the watch has 24 jewels. The 6R caliber is completely manufactured in Seiko's manufactory.