The Zenith 51.5 watch movement, which was used from 1978 onwards, is equipped with a quartz- controlled stepper motor. The movement features various functions, including hour and date settings with a pulled crown. To adjust the minute and second hands, the crown must be pushed for 5 seconds, released, and then pushed again until the desired time is reached. Additionally, this movement incorporates a sweep seconds hand, along with a quickset feature for the date. It is worth noting that the movement is powered by a reliable quartz mechanism and includes a calendar function.