The Bulova 10CSC watch movement, which was in use from 1957 to 1962, belongs to the first movement family featuring a micro rotor for automatic winding. It incorporates a self-winding gear system with direction switching facilitated by a pinion floating between two large jewels. In the 17-jewel versions of the movement, one of these jewels is replaced with a polished steel disc. The specific differences between the 663 and 666 variants are not known. The movement provides several functions, including automatic winding, sweep seconds, and Incabloc Shock Protection.