That's the 1952 mod. Gran Sport Extra in auction #7213183899
Timeline: 1952 - The Gran Sport Extra rear derailleur (second generation of Gran Sport) is introduced (changed body, large chromed mounting bolt and pivot bolt, holes in pulleys, extended horn shape to the outside pulley cage frame and revised cable clamp) along with the Sport single pulley rear derailleur. The Gran Sport down-tube shift levers are changed to single band clamp with flat-head screw friction adjusters, open cable without housing ("D" ring friction adjuster screw as option). Fausto Coppi wins the 1952 Giro d'Italia and Tour de France using Gran Sport derailleurs.
Chuck Schmidt South Pasadena, Southern California http://velo-retro.com (timelines, reprints & t-shirts)
ternst wrote:
>
> What's wrong with the cage plates?
> Ted Ernst
> Pakos Verdes Estates, CA
> ----- Original Message -----
> From: "Bob Freitas" <freitas1@pacbell.net>
> To: "CLASSIC RENDEZVOUS" <classicrendezvous@bikelist.org>
> Sent: Friday, January 20, 2006 10:14 PM
> Subject: [CR]eBay: CAMPAGNOLO gran sport rear derailleur 52
>
> > Notice that Kauzo is being out bid by 2 others.........................
> > BOB FREITAS
> > MILL VALLEY,CA
> > http://ebay.com/