The Cyma Tavannes 960 watch movement features a Breguet hairspring. It is a manual-wind chronograph movement with functions for measuring time intervals of 60 seconds, 30 minutes, and 12 hours, controlled by a pillar wheel. Additionally, it includes a sub-second function and a dual time feature that can be set using a pusher at 9 o'clock. The movement was used around 1945.