This NBA basketball was hand signed by 3 Boston Celtics Hall of Famers : Larry Bird, Kevin McHale and Robert Parish at a private signing. It is accompanied by a Certificate of Authenticity from Beckett Witness. 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.