The Fontainemelon 220 watch movement is an open face calibre with a stop function featuring a pillar wheel. It includes a glassed spare-parts compartment. These movements are commonly referred to as Leonidas movements, although they often bear the Venus signature, indicating their likely manufacture by Venus, potentially exclusively for Leonidas. The movement incorporates a timer function with a precision of 60 seconds (0.2 seconds) and a 30-minute counter, controlled by a pillar wheel system. Optionally, it can be configured to have a 30-second (0.1 seconds) timer and a 15-minute counter. It also supports an additional timer function. The movement is stem-wound and includes a sweep second hand. It was primarily used around 1949.