The oversize Record front hub came out about 1999. The Chorus page is from 1987 and the others are from 1986.

Your Google question actually reminded of a good source, created for just that purpose, by one of our members, Cuda2k. It's called VeloBase.com . He hasn't been at it for too long, so it's far from complete, but you can filter based on brand and component type, so you could just look at all the Campagnolo rear derailleurs if that is what you were trying to match. Given that your bicycle appears to be a real mismatch of components, VeloBase may be your best bet pending pictures.

Once you narrow things down, I'm sure Kommisar89 will be interested in the results And he will still want pictures.