The Kienzle 57/21 watch movement, produced during the period of 1969-1971, is a detached manual wind movement. It belongs to the 460/1460 family, which distinguishes itself from the 360/1360 family by its stem being unlocked by a pusher instead of a screw, as well as featuring a larger date display. Additionally, the Kienzle 57/21 movement incorporates automatic winding and includes a sweep seconds function.