The thing I find strange about all these derailleurs marked 36 denti is that I don't recall ever seeing a 36 tooth freewheel cog. Regina went up to 31, and Shimano and Sun Tour up to 34. Around 1980 there was a Sun Tour AG that went up to 38, but it used it's own special derailleur. Perhaps Campy and Zeus were putting a large max cog on the the derailleur knowing that it was a spec that couldn't be tested. This may be archaeological evidence that evil pointy-haired marketeers were already at work in southern Europe in the early sixties.
Leonard Bulger
Snowy Ann Arbor