The A. Schild 1539 is a mechanical watch movement with various bridge shapes. The differences between the 1, 10.5''', 2, 10.5''', 30, 31, 50, 65 old, 66 old, 70 old, 71 old, 73 old, 76 old, 78, 90, 91, 107, 108, 110, and 112 versions are not known. It is a manual wind movement with a sub-second function. The A. Schild 1539 movement was commonly used in watches around the period of 1940.