This autographed OAL baseball has been personally hand-signed by 10 members of the 500 Home Run Club including Mickey Mantle, Eddie Mathews, Harmon Killebrew, Willie McCovey, Mike Schmidt, Willie Mays, Reggie Jackson, Hank Aaron, Ernie Banks & Frank Robinson. This autograph is certified by James Spence Authentication (JSA). It comes with the numbered hologram and matching Letter of Authenticity.