I don't believe it was one of those (they look different). FWIW, one of these came up on ebay not too long ago (couldn't find it just now, though) and it was described by the seller (who seemed fairly knowledgeable on other things) as "one of the first Campagnolo mountain bike derailleurs".
Lee Berg Palo Alto, Calif.
Dave Feldman wrote:
> Weren't there some long cage derailleurs sold in some relation to the Contax
> triple crankset and Croce c'Aune group?