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A movement that functions like a quartz movement but is wound like a mechanical movement (an automatic watch with the precision of quartz).An automatic rewinding mechanism (oscillating weight) tightens the mainspring which, as it unwinds, triggers a micro-generator which converts mechanical energy into electrical energy. This power is stored in a battery. The system then works like a traditional quartz watch, i.e. the integrated circuit controls the power supply and delivers the pulses needed to drive the stepping motor.