Citizen’s main automatic movement in the early 1960s was their ‘Jet’ circular geared rotor design. This was replaced from around the mid-1960s with the more familiar swinging weight rotor. So here’s a little video which shows the two side by side:

http://s282.photobucket.com/albums/kk252/Sweephand/?action=view&current=20121003170746.mp4