This item has EXACT PROOF. What that means is we have a photo or video showing them signing this exact item where you can see the signature. Signed By: Bill Wyman. The ACOA certification number for this item is: SA63949. Autograph Pros, LLC, a seasoned autograph enterprise with 20 years of experience in the industry, provides signed memorabilia with a written Lifetime Guarantee of Authenticity. We guarantee that any item that is not already Third Party Authenticated will not fail authentication from PSA, JSA, ACOA, or BAS. Our inventory is readily available to undergo rigorous inspection by the 20,000+ RACC collector community to ensure that only 100% authentic autographs are offered for sale, in compliance with the RACC TS rules of the Code of Ethics. Moreover, Autograph Pros is a Registered Dealer (#237) of the Universal Autograph Collectors Club (UACC), established in 1965, and were honored with the UACC Autograph Dealer of the Year award in 2011. Additionally, Autograph Pros is an authorized dealer (#161) of the Autograph Fair Trade Association Ltd (AFTAL), the premier autograph club based in Europe. Although some Certificates of Authenticity may be considered mere pieces of paper, an Autograph Pros COA is recognized as one of the most reliable.