These companies provide certificates of authenticity, which indicate that ... build a collection of valuable and genuine ...

Whether it's sports memorabilia or stamps or vintage ... as any other pair of old shorts without my certificate of authenticity. But unlike my signed baseball cards, which include their ...

all equipment and memorabilia in the Authentic Game-Used Equipment, Milestone Game Equipment and Locker Room Issued Jerseys categories will come with a Certificate of Authenticity (COA ...