How much would a 23 karat gold mark mcgwire card be?
The only way to get the true value of a card is to get an expert to appraise it. If you want a value for insurance purposes, there will be a small fee. If you want to sell a card, it all depends on the condition of the card. A three card set on e-bay with a $30 minimum did not sell last week. You could look there and see if you can guess.
