The Langendorf 1357 watch movement, which was used in watches around 1943, is a manual wind movement with a sweep second function. It is similar to the Aurore 122 movement but also includes a sweep second hand. The Langendorf 1357 movement is considered equivalent to other movements such as the Aurore-Villeret 120, Bulova 6AH, and FHF 120, as there are conflicting exchangeability data on various movement registers. It is worth noting that the Bulova calibres have design details absent in FHF calibres, suggesting that the ebauches may have originated from Aurore-Villeret. The differences between the Langendorf 1357, 126, and 128 movements are not known.