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