This Autographed Spalding Larry Bird NBA MVP Indoor/Outdoor Basketball has been Personally Signed by Wilt Chamberlain of the Los Angeles Lakers. This item is 100% Authentic and comes with a PSA/DNA Certification Card and a matching numbered Hologram. The authenticity can be verified on Professional Sports Authenticator website. The bladder of the ball has been repaired to make sure it does not leak in the future. For that reason the ball feels a bit off, but displays very well!