The International Durowe 861 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 International Durowe 861 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.