This 20'' x 24'' photograph has been personally hand-signed by Muhammad Ali. Each item signed by The Champ is witnessed and recorded by a trained verification expert from Online Authentics. All registered items then have a unique number assigned which corresponds to the number on a unique Certificate of Authenticity paired with each signed item. The COA and its registration number allow collectors to verify their items by simply entering the registration number into the Online Authentics website. Each item has been personally signed by Ali and is not an autopen signature.