The Leonidas 120 watch movement, in use around 1919, incorporates several notable features. It includes a Breguet hairspring, a monometallic screw balance with four adjustment screws, and is equipped with a stem-wind chronograph function with 60 seconds and 30 minutes registers, controlled by a pillar wheel. The movement also supports stem-wind and pin or lever set functionalities, as well as a sub-second display.