The Langendorf 1336 watch movement, manufactured from 1957 onwards, is equipped with the Incastar regulator. This regulator stands out as the sole widely produced regulator incorporating a free oscillating hairspring. By securing one end of the spring between two rollers and adjusting its length, isochronism error resulting from the gap between the regulator pins is eliminated. The movement functions with a manual wind mechanism and features a sweep second hand.