The A. Schild 1664 watch movement, produced during the period 1950-1954, belongs to the first gents automatic-family with a ball-bearing rotor. This movement went through various modifications, such as the change from T- to U shock device and a modified calibre, resulting in several variants. The presence of TC versions for all calibres remains uncertain, and only the known variants are listed. Additionally, the movement features a detached manual wind mechanism, with further details available in the 1249UC model. Notably, the A. Schild 1664 movement incorporates the following functions: automatic winding, sweep second hand, and a date feature.