The Certina 25-652M watch movement features a jewel-bearing rotor and a sophisticated excenter self-winding mechanism with just one gear stage. It includes an easy-to-operate rotor lock and a fixed mainspring with a friction clutch on the pawl wheel. The movement is part of the Otero family, and there have been various Dugena designations for the same Otero calibre. Additionally, the movement includes automatic winding and a sweep second function.