Actually I didn't say they didn't have a Lavet motor, I said theyTinker had mentioned that most of the stepping motors used are not Lavet and used some type of ratchet mechanism. Maybe I was wrong about them being Lavet motors. I took apart several standard quartz movements and ran them with just the rotor installed. They all rotated in one direction. This must mean that there is no ratchet type mechanism to give it a preferred direction.
had a ratchet like device to ensure they go the right way.