The ETA 2366 watch movement, manufactured between 1963-1966, features an automatic mechanism with a ball-bearing rotor, incorporating a peripheral gear that is positioned slightly off-center. This movement is typically equipped with five ruby balls. It is characterized by a relatively large balance and includes a ratchet on the dial side, along with a crown mechanism featuring a rocker bar. Additionally, the ETA 2366 movement offers sub-second functionality and a date feature that can be adjusted by changing the time between 22:30 to 24:00 hours.