"The stuff of legend"  Campagnolo Special Grease, found by just about every cyclist to pick up a BB tool and repack a long neglected campagnolo equipped bike made in the 70's or 80's (and likely before that too).  Also often found in hubs, headsets made by Campy or any other brand for that matter that had been maintained by a campagnolo loyaltist.  Campagnolo model numbers 3385, 3386 and 3387 for different sized containers. 

Small cans can sell for $35-$60 on ebay.