I have two all-original bikes, a 1961 Olmo and a 1962 Atala, both with Campagnolo shift levers. The 1961 Olmo has "open G and open C" levers, while the 1962 Atala has "closed G and closed C". The change must have been made by 1962, or a bit earlier if Olmo was using-up stock.
"close fridge and open beer"
> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1819220319
> > >
> > ...Seems like a decent guy to deal with...
> Maybe so but he ought to be more careful about the dates
> he attributes to the parts he's selling. Those shifters
> are most likely from the 60's, perhaps even as late as
> 1968 or 1969.
> Fred Rednor - Arlington, Virginia