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An automatic movement is purely mechanical and uses a movement made of springs and gears to power the luxury replica watches. An automatic caliber which is also called a self-winding movement is wound up when first used, usually via the winding crown and then is "recharged" via a rotor using the kinetic energy generated as you wear it. The rotor spins as you move your wrist around and in turn, winds the mainspring in the watch's movement keeping it fully charged. There is even a mechanism that disengages the winding gears when the spring is fully wound so that you do not overwind the spring.