The Forster 500 watch movement is an open face calibre mechanical movement that was used around 1949. It features a timer rattrapante function with 60s (0.2s) accuracy and a range of 30 minutes, facilitated by two pillar wheels. Additionally, there are options available for a 30s (0.1s) accuracy with a 15-minute range, as well as an addition timer function. The movement is stem wind, with a sweep second hand and a sub-minute dial. It also incorporates a timer function and a split-second function.