This stitched jersey was hand signed by former Boston Celtics 1991 NBA Slam Dunk Champion Dee Brown at a private signing. It is accompanied by a Certificate of Authenticity from Palm Beach Autographs and JSA. A tamper-evident hologram will be affixed to the item. Signed items are guaranteed to pass any third-party authentication with 100% Money Back Guarantee. Each signature is witnessed by a member of our staff or comes out of a private signing.