The Doxa 41 watch movement, utilized during the period 1929 onwards, features a hunter calibre with a monometallic screw balance and a Breguet hairspring. Additionally, it incorporates a sub second function, a stem winding and setting mechanism, and a hack feature. It is worth noting that the Doxa 41 may also be referred to as the Junghans J43a, indicating a possible interchangeability with Junghans watches, though this remains uncertain.