DENVER BRONCOS 1980's game used knee brace / handwritten #7 on side All autographs come with a certificate of authenticity from Mike Munns Autograpgs that guarantees the signature(s) for the life of the item. We are registered dealers with the UACC (RD#212) and have been selling autographs since 1986. We recently ended a 15 year relationship with Ebay where we had a 99.9% positive feedback rating with over 9,000 transactions. Questions are welcome.