The Citizen 7610 watch movement features a jewel-bearing rotor and a sophisticated excenter self-winding mechanism that operates with just one gear stage. It includes an easy-to-use rotor lock and is available in two sample variations. Early samples are equipped with a slip spring, while later samples have a fixed mainspring and a friction clutch on the pawl wheel. The movement incorporates functions such as automatic winding, sweep seconds, date display, and a calendar. The Citizen 7610 was produced around 1955.