The Cyma Tavannes 930 is a manual wind watch movement with a sweep second function. It features a Breguet hairspring and a regulator with a catch device for the hairspring. The Cyma Tavannes 930 is essentially the same as the DS27 movement, but with a different name. It also includes additional functions such as a date feature, which can be set by a pusher at 2 o'clock. The Cyma Tavannes 930 movement was predominantly used around the year 1945.