The Buren 1321 watch movement, which is a part of the Louis Brandt Collection, was first introduced in 1984 with a limited production run of 193 units. It is based on the bas calibre 711 and features an 18K gold rotor. This automatic movement offers a sweep second function and includes a perpetual calendar that can be set using pushers. Additionally, it has a moon phase feature that can be set by a pusher. The Buren 1321 movement was used during a period around 1964.