The Certina 29-151 is a mechanical watch movement that was in production from 1972 to 1974. It features a Triovis micrometer regulator for precise timekeeping adjustment. The stem can be released using a slide mechanism. Notably, the watch is not self-starting, but it incorporates a hack mechanism that stops the balance in a position to ensure reliable starting when the crown is pushed in. In terms of functions, the Certina 29-151 includes an electronically controlled balance motor, sweep second hand, day indicator, quickset date function, hack feature, adjustable stud holder, electronic component for increased accuracy, shock protection, and a calendar.