Nope,
This is a garden variety 1953 plus model that in nice used shape rarely goes over $150ish - and a number of them are in great shape from this era.
The 6K example was from the first production year, 1951, and was the first and rarest of the version of that year's production. The 1951 units are much more hand-worked and have numerous unique features. The 6K example was I dare say a fair price for perhaps the rarest Campagnolo item ever sold on ebay. The current example in question is extremely common by comparison.
Mike Kone in Boulder CO
> On German eBay a
\r?\n> CAMPAGNOLO 1950 GRAN SPORT REAR DERAILLEUR USED Artikelnummer:
\r?\n> 170166030612
\r?\n>
\r?\n> Starting bib .99 Euros
\r?\n> Isn't the same model that sold for over $6000.00 (Yes that is $6000.00+)
\r?\n> US on ebay a few weeks back?
\r?\n> Charles Nighbor
\r?\n> Walnut Creek, CA