Not positive, but I am pretty sure greysheet uses info from many finished auctions and actual prices that are realized for these coins. They look at hundred/thousands of transactions that go on with dealer to dealer purchases and numerous auctions (live, online, etc) to come up with some guidelines and ballpark figures and then as justcarl alluded to, they probably sit in their rooms and pull some #'s from a hat to finalize the prices :)
I think that is why Greysheets are the most widely accepted priceguide, because they look more at what is actually being paid for these coins in real transactions, not just what they are "worth".
I think that is why Greysheets are the most widely accepted priceguide, because they look more at what is actually being paid for these coins in real transactions, not just what they are "worth".



















