The Junghans 684.77 watch movement features a pin-lever escapement and a ratchet on the dial side, accompanied by a crown mechanism with a rocker bar. This mechanical movement is manual wind and incorporates a sweep second hand. Additionally, it offers a day and date display, with the date being set by changing the time from 22:15 to 24 hours. The movement further includes an adjustable stud holder and a calendar function. The Junghans 684.77 movement was utilized during the approximate period of 1975.