From Campagnolo Catalog site - Campybike

Modern era: 1995 - present
Classic era: 1984 - 1994
Vintage era: 1983 and earlier

I know the vintage bike rides have mid-80s (friction shifting, non-aero brake levers) cut offs, I believe.

I'm "restoring" a bike to adhere to "mid-late Classic Era" parts. Next project will be a Vintage Era bike.