Custom on-field style jersey. Everything is sewn on, size XL. Hand-signed silver paint pen by Bill Mazeroski (HOF). 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 with a QR code that verifies the authentication on the Beckett website. Shop our ebay store / Friendly Confines Collectibles for thousands of different autographed jerseys