Mickey Mantle signed Hall of Fame plaque postcard. Mantle signed the back of this 5x7" postcard in red ink. The signature is large and bold and grades a 9/10. The postcard is in near-mint condition. Mantle is widely considered to be one of the greatest sluggers in baseball history. He hit 536 home runs during his career and was inducted into the National Baseball Hall of Fame in 1974. This postcard features Mantle's bronze Hall of Fame plaque on the front. Full LOA from PSA.