The Unitas 201 watch movement is a manual wind movement with a sub second function and option for sweep second. This movement was likely used around the period of 1940. There are known differences between the Venus 110-113 and 117-119, as well as the 128 and 159, but the specific nature of these differences is not disclosed. It is believed that these differences may pertain to variations in bridge shapes, although this is not confirmed.