The A. Schild 1623 is a ladies' wrist-watch calibre that incorporates an open face design and features a cylinder escapement. Its left-handed ratchet-wheel screw enables efficient winding and setting through a stem mechanism. Derived from the Marc Favre 161, the specific distinctions between the A. Schild 1623 and its counterparts, the 181 and 3479, are currently unknown. The movement includes several functions such as stem winding and pin setting, as well as a sub-second dial. It was primarily used during the approximate period of 1910.