The Longines 341 watch movement, in use since 1962, features a micro rotor and double jewel bearing. It is equipped with a double excenter regulator for curb pins and stud carrier, as well as a self-winding gear with direction switching facilitated by a pinion floating between two large jewels. Its indirectly driven minute and second hands enable a low-profile design. Since approximately 1966/67, minor modifications to the base plate and a simplified date driver have been implemented. This movement offers several functions, including automatic winding, a sweep second hand, a date function set by changing the 23-24h or 22-24h, Incabloc Shock Protection, and a calendar feature.