Bulova 10BZAC

American-made automatic movement produced by Bulova from 1959 to 1963. One of Bulova's premium self-winding movements featuring 23 jewels (also available in 30-jewel variant). Part of the 10-series family that represented Bulova's finest American-made automatics. Features sweep second hand and approximately 40-hour power reserve. The 'AC' suffix indicates automatic with center seconds. Commonly found in Bulova '23' and '30' model dress watches. Unadjusted movement operating at 18,000 vibrations per hour (5 beats per second).