This Autographed Official NBA Game Basketball has been Personally Signed by John Havelicek, Magic Johnson, Larry Bird, Karl Malone, Shaquille O'Neal, Julius Erving, Hakeem Olajuwon, Clyde Drexler, Billy Cunningham, Oscar Robertson, Dave Bing & Bob Petit. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website.