The Cyma Tavannes 706 watch movement, which was likely succeeded by the Muller-Schlenker 17a, is a manually-wound movement with a pin-lever escapement. Its two-layer base plate features bushings for almost all bearings, allowing for variants with additional jewels. An interesting design feature is the replacement of the setting-lever spring, yoke, and yoke spring with one simple part. The movement incorporates a sub-second function and was produced around the 1970s.