Description:Connie Mack double autographed 1939 Hall of Fame Induction postage stamp. Vintage 1939 Hall of Fame Induction postage stamp signed twice, "Connie Mack" in black fountain pen. Signatures rate 8 out of 10. Relatively light postal cancellation markings are visible across the front. Includes LOA from JSA and letter of provenance from Spook Jacobs: EX