This autographed jersey has been personally hand-signed by Mark Chmura of the Green Bay Packers. This autograph is certified by Beckett Authentication Services (BAS) Witness Certification. That means that a Beckett representative was present when this item was signed. It comes with the numbered authentication hologram and matching Certificate of Authenticity. Shop our ebay store / Friendly Confines Collectibles for thousands of different autographed jerseys