Commemorative Gateway cover, 9.5 x 4.25, with a cachet honoring the 150th anniversary of baseball in America and the 500 Home Run Club, signed in blue ballpoint by nine members of that elite group. Signers are: Ted Williams, Hank Aaron (black ballpoint), Mickey Mantle, Reggie Jackson, Willie Mays, Willie McCovey, Harmon Killebrew, Frank Robinson, and Eddie Mathews. In fine condition. The cover was signed at the famed Atlantic City show. Pre-certified Steve Grad/PSA/DNA and RRAuction COA.
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