The Cyma Tavannes 063 watch movement is a hunter or open face calibre with a bimetallic screw balance and a Breguet hairspring. It is one of the 19''' calibres listed in the Ronda staff list from 1965, which includes the Phenix 776, 782, 783, and 786. However, it is uncertain whether the specific 19.5 movement shown here is one of them. The movement features functions such as stem winding and setting, as well as a sub second hand. It was likely used during the period around 1920.