This Autographed Game Used White Russell Athletic Home Size 48 +1 Sleeve Length Jersey with the inscription of “To Shaq, The Best To You On A Hall Of Fame Career” has been Personally Signed by Mark McGwire of the Oakland Athletics. 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. The jersey also comes with a letter of authenticity from Sports Investors Authentication for the game use along with a letter of authenticity from Shaquille O’Neal for the provenance as well. Our items are sourced from PPC autograph signings or direct from leading suppliers of authentic memorabilia. The companies that authenticate these items include Beckett Authentication Services (BAS), Professional Sports Authenticator (PSA/DNA), James Spence Authentication (JSA), Steiner Sports, Upper Deck, Fanatics, Mounted Memories, and Tri-Star Productions. All autographed items come with a Certificate of Authenticity (COA) from these suppliers that includes a tamper proof hologram affixed to the item. Press Pass Collectibles has exclusive autograph relationships with over 50 professional athletes and celebrities including Magic Johnson, Chevy Chase, Travis Kelce, DK Metcalf, Justin Jefferson, Randy Moss, Kyler Murray, Adrian Peterson, Baker Mayfield, Ray Lewis, George Kittle, Dak Prescott, Jerome Bettis, Chase Claypool, Deion Sanders, Jack Lambert, Mean Joe Greene, T. Watt, Tony Dorsett, Devin White, Tony Gonzalez, Emmitt Smith, Michael Irvin, Jason Witten, Jared Allen, Kurt Warner and more! Shop our entire collection.