The ETA 2840 watch movement, which was utilized around 1965, features a rotor positioned out of center and integrated winding gear. This design resulted in an exceptionally slim movement for its time. The movement incorporates a detached manual wind and Helvetia escapement. Additionally, it is equipped with Kif-Duofix combined settings for the escape wheel. Noteworthy functions of this movement include automatic winding, sweep seconds hand, adjustable stud holder, and shock protection. Its notable feature is the implementation of a ball-bearing rotor.