Mark Spitz autographed 1991 U.S. Olympic Hall of Fame swimming card

1991 U.S. Olympic Hall of Fame card autographed in blue Sharpie by legendary swimmer Mark Spitz. Obtained in person at San Diego USS Midway Museum appearance many years ago. NrMt or better condition. With certificate of authenticity from AutographsForSale.com. ONLY A FEW LEFT.