Well for lack of a better definition the
Classic Rendezvous defines classic as 20 years old
or older. They have a definate affinity for lugged steel
frames, but the odd alu, carbon or Ti frame makes it
into that category.
I'd say if you're thinking Masi, Colnago, Cinelli, Bianchi,
Legnano, Frejus, Paramount, Raliegh, Hetchins, Drysdale
Eisentraut, Baylis, Confente you're in the right ballpark.
(the above list for Roadbikes only, ok?).
Hope this helps make things clear as mud.

(oh yeah, Richard Sachs, Moon, RIvendell for modern
"Classics").

Marty