The Cortebert 677C watch movement is a manually-wound chronograph movement with a pillar wheel. It features a Breguet hairspring and is available in different variations (285, 287, 288, 292) that only differ in pillar plate sizes. The movement includes functions such as a 60-second chronograph, a 30-minute chronograph, a 12-hour chronograph, and a sub-second display. It was utilized around the period of 1945.