The Eterna 1406G watch movement features a pin-lever escapement and incorporates indirect second and minute functions. The movement also includes a ratchet mechanism on the dial side, with a crown mechanism using a rocker bar. The back side of the movement is painted in a golden color. Minor modifications have been made to the base plate and date disc, and late samples of the movement include a mobile stud carrier. The movement has three main functions: manual winding, sweep seconds, and a date setting that involves changing the time to 22:40-24h.