A T206 Honus Wagner baseball card has sold for $6.606 million -- which includes a 20% buyer's premium -- breaking the record for highest-selling sports card of all time.

The previous record belonged to a 1952 Topps Mickey Mantle card that sold for $5.2 million in January, a record later matched by a 2003-04 Upper Deck Exquisite Collection LeBron James-autographed rookie jersey card in April.