Peter,
The true first-generation Record front derailleur had a pivot arm secured by a screw rather than a rivet. This screw can be seen on Hi-Campy's site if you scroll down to the Record FD pics:
http://www1.ocn.ne.jp/
Your auction photos clearly show the rivet/pin. So yours may indeed be early if it has the chromed arm and unslotted cable stop, but is not, at least technically, first generation in the sense meant by Campagnolo collectors. Others more expert can confirm, I hope.
Ed Granger
Lancaster, Pennsylvania, USA