The Unitas 6380 is a mechanical watch movement that was in use from 1958 to 1963. It features a flat freesprung hairspring and a DuraBalance regulator, which consists of a balance with two regulating weights that can be shifted simultaneously along the spiral-shaped spokes using a regulator lever. The balance is protected by screwed cap-jewel plates, and shock protection is provided by elastical balance spokes. The movement function includes manual winding and a sub-second display.