The A. Schild 501 watch movement is an open face calibre that underwent detail modifications throughout its production period. It features a timer function with a precision of 60 seconds (0.2s) and a duration of 60 minutes, employing a pillar wheel mechanism. Additionally, there is an option for a timer with a precision of 10 seconds (0.1s) and a duration of 10 minutes. The movement is stem-wound and includes a sweep second hand and a center minute hand. The A. Schild 501 movement was utilized around 1949.