The Unitas 201 watch movement features a pin lever escapement and a ratchet on the dial side. It includes a crown mechanism with a rocker bar. The 051/01 movement belongs to a series of similar movements, such as the 051/03, 051/03a, 051/04, 051/04a, and 051/04e, that have just minor differences. The movement offers manual winding and includes a sub-second function. It was commonly used around 1955.