This is a large 37mm. 1940’s Universal Geneve Aero-Compax in stainless steel-the case is close to pristine. The dial was expertly restored. The manual winding Universal Geneve movement is accurate with all functions operating correctly. This watch was way ahead of its time when introduced in 1941. The 9:00 crown allows setting for a separate “clock” located at 12:00 allowing the user to keep track of time in a separate time zone. This is a very practical traveler’s watch. This Aero-Compax will command attention to your wrist.