The Phenix 930 is an open face calibre watch movement featuring a Breguet hairspring and a negative stem mechanism specifically designed for the US market. Variants of this movement were produced with different heights and stem mechanisms, including one with a larger diameter to fit US cases. These movements are labeled with their diameter in lignes and height in 1/12 lignes or a newer three-digit designation. The Phenix 930 movement includes stem winding and setting capabilities, a sub-second function, and was commonly used during the approximately 1940 timeframe.