The International Durowe 1977-4 watch movement is a mechanical movement used during the period of 1947-1953. It features a Breguet hairspring and offers manual winding with a sub-second function. Additionally, it provides the option of a cover plate and raised hands to accommodate a strongly curved dial. While it is partially based on the ETA 735 movement, the specific differences between the 7AA, 7AH, and 7AK models are not known.