Er, that one that sold at Mecum last week for 55k wasn't a sandcast though.
It's odd it sold so well, as far as I know it's the 3rd highest price for 750 ever, behind only the auctions for the prototype and the Bimota HB1. There was only 1 sandcast at Mecum last week, a very nice restored one, it made 32 or 33k.