The Buren 20 watch movement, produced between 1974 and 1984 with a total of 11,000 units, is a manual wind movement with a sweep second hand and hack feature. It incorporates a fake bridge to conceal the empty space for the automatic gear, which is a notable characteristic originating from its automatic design. The movement includes shock protection and offers a stop seconds function, allowing for precise time setting. Additionally, it features a sweep seconds hand for continuous time measurement.