The Bettlach 8157 is a mechanical watch movement that was in use from 1970 onwards. Notable features include the integration of the winding gear directly into the movement, rather than attaching it to a manual-wind calibre as is common. This design, along with an indirectly driven minute hand, allows for a sturdy movement with a relatively large balance and low profile. The movement offers various functions, such as automatic winding, a sweep second hand, a quickset day function with two language options, a quickset date function, and a hack feature.