The Unitas 501 is a manual wind mechanical watch movement that was introduced in 1972. It features a sweep second hand and offers day and date functions. The day can be set by changing the time between 20:45 and 0:10 hours, while the date can be set using the pusher located at 8 o'clock or by changing the time between 20 and 24 hours. The Unitas 501 movement was utilized during the period of 1972 and onwards.