The Buser 6 watch movement, which was later renamed Omega 381 in 1948, is a manual wind movement with various functions. These functions include a sub second display, day and date display (both of which can be set using pushers at 4h and 2h respectively), month display (which can be set using a pusher at 2h), and a moon phase display (only settable by a pusher at 8h). The movement also features a calendar and is known to have been used from 1948 onwards.