The Unitas 166 watch movement features a straight lever and an indirect minute, hand friction clutch on the barrel. It includes a ratchet on the dial side and a crown mechanism with a rocker bar. The movement has a two-layer base plate, with a thread near the 2nd-wheel bearing for a decorative screw that imitates a separate train bridge. The movement is manually wound and includes a sub-second function. It was manufactured around 1935.