A mint condition Mickey Mantle baseball card from 1952 sold for $12.6 million at auction. It’s now the most valuable piece of sports memorabilia in history. Mantle played his entire career with the New York Yankees and is considered the best switch hitter in the history of baseball. He was inducted into Baseball’s Hall of Fame in 1974. Anthony Giordano has owned the card since 1991, the year he purchased the card for $50,000.