Self-winding watch is a mechanical watch, self- winding watch mainspring is wound automatically by the natural motion of the wearer's arm, to make it is unnecessary to manually wind the tungsten alloy watch. Most mechanical tungsten alloy watches sold today are self-winding watches.
(You can see more details in http://en.wikipedia.org/wiki/Automatic_watch)
How Self-winding Watch Works?
The mechanism of most tungsten alloy actuator movement is based on the hand-winding mechanical watch movement.
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