Sam Lingo wrote:
>
> 1950 campy grand sport pivot bolt, oldist part i know (snip)
Sam, I think you're referring to the 1953 version of the Gran Sport
which had black oxide (not black anodize) mounting and pivot bolts; the
previous versions had chrome plated bolts:
>From the Campagnolo Timeline <http://www.velo-retro.com>:
1950 - The Gran Sport twin cable, parallelogram rear derailleur prototype is shown at the Milan trade show.
1951 - The Gran Sport single cable, parallelogram rear derailleur (chromed bronze, large chromed mounting bolt and pivot bolt...
1952 - The Gran Sport Extra rear derailleur (second generation of Gran Sport) is introduced (changed body, large chromed mounting bolt and pivot bolt...
1953 - In August the definitive Gran Sport rear derailleur (third generation of Gran Sport) is introduced: changed body, pulley cage reverts to first version, no holes in pulleys, smaller black oxide mounting bolt and pivot bolt...
Chuck Schmidt South Pasadena, Southern California http://www.velo-retro.com (Timelines, Reprints & T-shirts)
.