The A Michel 544 is an open face calibre watch movement that was primarily utilized around the period of 1930. It features a timer with a 60-second measurement capability with an accuracy of 0.2 seconds, along with a 30-minute measurement function, driven by a pillar wheel mechanism. Additionally, there is an optional setting available, which allows for timing intervals of 30 seconds (with 0.1-second accuracy) and 15 minutes. The movement is manually wound using a stem winding system. It includes a sweep second hand, as well as a sub minute indication.