Item has been authenticated by James Spence (JSA) Authentication service.  JSA is listed by Ebay as a "Recommended authentication and grading company".  The Certificate of authenticity from JSA comes with the ball.    

James Spence (J.S.A.) Authentication Process:  Each item is methodically examined and reviewed by each of our authenticators individually to ensure their expert instinctive impressions are in agreement. This intuitive sense has been developed after many years of examining thousands of autographs. The expert is extremely familiar with many different variations and evolution of an individual's signature and can quickly identify irregularities evident in a clubhouse, secretarial, or forged signature.  A Standard Letter of Authenticity (LOA) - Highly sought after by collectors, dealers and hobbyists alike, our standard LOA contains a digital color image of the item and live signature of autograph expert James Spence, which is witnessed by a licensed Pennsylvania notary public. Additional data may include quantity of signatures, manufacturer, make &/or model of the item. It accompanies any item that passes our authentication process and qualifies for the standard letter. A certification label is placed on the item or letter (customer preference) with the corresponding number appearing on the LOA. It is accepted by any major auction house in the country and is viewed as THE letter to have when either displaying your prized possession or offering it online. To maximize the value and interest of your signed collectible, one should have a James Spence Authentication

Our items are guaranteed authentic and all come with a certificate of authenticity and a trackable unique serial number on a tamper proof hologram sticker that can be verified and tracked on the authenticator's website