PowerMEMS
Created by the Besançon-based company, SilMach, PowerMEMS are high-resolution, electrostatic motors etched from silicon wafers. Compact, non-magnetic, low-energy, extremely light, and mass produceable to within incredibly tight tolerances, PowerMEMS appear to be an ideal candidate as a successor to the Lavet-type stepping motors traditionally used in battery-operated, analog wristwatches.
Image credit SilMach S.A.