This Mark Prior autographed baseball card is a valuable and rare part of the 2001 Donruss The Rookies set, featuring a hard-signed authentic autograph from the former Cubs player. It is encased in a protective slab and accompanied by a Certificate of Authenticity (COA) and an Autograph Authentication Number (00016507852) from Beckett Authentication Services (BAS). Made from high-quality cardstock material, this standard-sized card is a must-have for any sports trading card collection, especially for fans of the Chicago Cubs. Don't miss your chance to own a piece of baseball history with this Mark Prior rookie card autographed in blue Sharpie. Authenticated and encapsulated by the experts at Beckett Authentication Services (BAS). Certificate number 00016507852.