Ok my theory on the top end of town (say 50k plus) Big money can be made buying something listed as EF in a British auction, carry it to the US, slab it at say MS62-65 then give it to one of the big U.S. auction houses... Then watch and voila! Big profit. Oh yeah make sure it's a household name variety coin eg una and the lion or such...that means milled preferably gold. Definitely not hammered silver..remember the U.S. Market very often sells coins at the Million plus mark and some well known non US coins are heading there..