That was the first version of 1952. The 1951 versions are even rarer, and probably more expensive. The final, mass-produced version was introduced in 1953.
There was an article on all these early Campagnolo Gran Sport derailleurs in Vintage Bicycle Quarterly Vol. 2, No. 2.
Jan Heine
Editor
Bicycle Quarterly
140 Lakeside Ave #C
Seattle WA 98122
http://www.bikequarterly.com
>Anybody been watching this one?
>
>http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=170044564481
>
>Wow. Not the seller, and no chance of being the buyer....
>
>David
>--
>David Bilenkey
>Ottawa, Ontario, Canada
>dbilenkey@sympatico.ca
>
>http://www.wooljersey.com/gallery/Bilenkeys-Bikestash