Self-winding automatic

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self-winding automatic

Explosionszeichnung des Bidynator Werkes

Referring to watches, this means a wristwatch having a self-winding mechanism. As contrasted with the traditional mechanical wristwatch which requires manual winding, the watch with an automatic mechanism has an eccentric rotor, called a winding rotor, that moves as the wearer's body moves. That movement of the winding rotor is then captured by a ratchet to automatically wind the watch's mainspring.