Re: Campagnolo 1052/1, Record How rare are these front mechs
I think (though its difficult to be sure as I don't have all of the catalogues) that Campag used the same reference, 1052, from the introduction of the Record derailleur until they changed the numbering system in about 1983(see pic which is from the 1982 catalogue). So 1052 could refer to the Record, Nuovo Record and Super Record models, the /1, /2 is a Velobase addition I think.
The different versions are usually referred to by their description - 'no-lip', 'with lip', '4 hole', '3 hole' each of which was around for different periods. There were certainly other variations and some of the parts, but not all, are interchangeable. Super Record is easier to identify by the black anodizing.
The rarest seem to be the early 'no-lip' and intermediate 4 hole versions and the most common the '3 hole'.
As always with period stuff price is affected by rarity and condition. You do see some advertised for lots of money (£100 plus) but you should be able to get a good example for £30-50.
I hope this lengthy answer is helpful and if anyone can add anything that helps with the dates of the various models I would be most grateful!
Dave