The Tissot 2551 watch movement, used from 1968 onwards, features a manual wind mechanism with an optional excenter regulator. Notably, the train and hand gears are driven separately by the barrel. The movement incorporates an Offset Center Wheel, allowing for the display of day and date functions. Additionally, it includes a sweep seconds hand and calendar feature, with the date being set by changing from 19:20 to 24 hours.