I picked up this Zeus a couple weeks ago. From what I have gathered so far I believe it's ~late 60's-early 70's.
I originally started a thread in the C&V appraisal-inqury section which can be seen here..... http://www.bikeforums.net/showthread.php/925377-Zeus
Much thanks to juvela for sharing quite a few details about early Zeus bicycles and also much thanks to afilado for hooking me up with a very nice Super Alfa brakeset.
Still searching for Zeus specific (French threading) top tube cable clamps, cable guides, 5 speed freewheel, 165/170mm crankset and BB.
There does not seem to be a lot of info available on these bicycles and I welcome anything you may have to share.............