The Unitas 307 watch movement features a hunter calibre and is equipped with a bimetallic screw balance that is adjustable through four adjustment screws. It is further enhanced by a Breguet hairspring, which contributes to its precise timekeeping. The movement incorporates a negative stem mechanism and varying bridge shapes. It performs various functions including stem winding and setting, sub-second display, and reverse winding. The Unitas 307 movement was predominantly used around the 1930s.