Based on the information here, and after some time looking at the 90-97 catalogs here is where I'm putting the break points for Campagnolo's C-Record/Record groups on VeloBase.com:
Corsa Record (aka C-Record): 84-90
Record (1991-1994) - 8sp Record w/ new Derailleur, Ergo shifting, etc etc
Record (1995-1997) - Last of the 8sp Record
1997 puts us well out of "Vintage" territory at least for another 5 or so years so I'll stop there.
There is some overlap between each group, and that usually only diminishes a fair bit a year or two after the roll over.
Of course, other groups experienced much the same sort of transition during the same time period, Chorus, Athena, and CdA all underwent a large amount of change from 89 to 93. And with Campy's love of trickle down technology, yearly changes of model numbers (or complete omission of model numbers in several catalogs) it is going to be a challenging task to represent these changes as accurately as possible. Fun stuff!