The A Michel 542 watch movement, also known simply as the Bifora 910, was manufactured starting in 1964. In later versions, the setting lever was equipped with a pin instead of a screw, and the minute wheel also had a pin. These updated components can be used in earlier versions by removing the minute-wheel pin from the plate and/or using a modified setting-lever spring. As for its functions, the A Michel 542 movement featured manual winding, a sweep second hand, automatic winding, and a calendar.