The Buser 140 is a mechanical watch movement that was introduced around 1964. It shares many similarities with the 3100 movement, but the exact differences between the two are not known. The 3102 movement features several functions, including a manual-wind alarm, a sweep second hand, and a date function that can be set by changing the time between 22-24 hours. This movement has been utilized in watches produced from 1964 onwards.