AdvertisementA Mickey Mantle baseball card is now the most expensive piece of sports memorabiliaUpdated August 28, 2022The Associated PressfacebookEmailA Mickey Mantle baseball card is displayed at Heritage Auctions in Dallas, earlier this summer. A mint condition Mantle card has sold for $12.6 million, blasting into the record books. (AP)This article was originally published on August 28, 2022.