The Felsa 4035 watch movement is similar to the 285 movement but features a flat hairspring instead of a Breguet hairspring. The 385 and 387 movements primarily differ in their pillar plate sizes. This particular movement is a manual-wind chronograph with a duration of 60 seconds and additional 30 or 45-minute counters. It utilizes a pillar wheel for its chronograph function and includes a sub-second display. The Felsa 4035 movement was commonly used around 1945.