The Bettlach 1465 watch movement, also referred to as the Germany Military Movement or Wehrmachtswerk, is a manual wind movement with a sub second function. It features additional functions such as day, date, and calendar, which can be set by changing the 22-24h. This movement was commonly used around the period of 1950. The differences between the 6415 and 6416 are unknown, but it is speculated that they may simply be designations for varying bridge shapes.