Jan Heine wrote:
>
> On e-bay, some nice photos of a rare second model Gran Sport
> derailleur from 1952... Item No. 2202249887
>
> According to the upcoming article in Vintage Bicycle Quarterly, this
> is version 52-2 (there were 51-1, 2, 3 and 52-1 before that). The
> next iteration was the series-produced model.
This version of the Gran Sport derailleur actually has a model name. It is in the 1952 Campagnolo catalog as a "Gran Sport Extra" (easily identified by the extended nose on the upper end of the outside pulley cage).
http://i7.ebayimg.com/
Chuck Schmidt South Pasadena, Southern California http://www.velo-retro.com (Timeline, T-shirts and reprints)
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