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Thanks @HerrJ, no it's definitely Nuovo Record, 6th Generation I think with the cut outs on the rear plate not the front, and a much slimmer profile than the GS
EDIT: It's not the best photo of it I admit, you can't really see the profile but it is like this:
http://www.velovilles.com/en/parts/Front-derailleur/NUOVO-RECORD-Derailleur-front-oxid-5.html
http://hilarystone.com/images/sale%20images/Campag%20gears%20front/CGF1A.jpg
Very nice project! But, correct me if I am wrong, your front mech is actually a gran sport (campagnolo 3600/NT) not a record one.