The Bettlach 8381-67 watch movement, introduced in 1961, is an enhanced version of the 1035 movement. It features a larger barrel and utilizes Duro-Swing shock protection instead of Duro-Shock. The movement is manually wound and includes a sweep second function. Additionally, it incorporates a calendar with the ability to set the date by +/-24 hours. The Bettlach 8381-67 movement is known to have been used in watches from 1961 onwards.