Champion Sports Collectibles,Inc Certificate of Authenticity Signed NBA Wilt Chamberlain Basketball
Thank you for contacting Mearto with your appraisal inquiry. Based on the photographs and description provided, the subject of this appraisal is a Spalding NBA basketball autographed by Wilt Chamberlain (1936-1999). According to the current owner, the piece was acquired via inheritance. The piece features a certificate of authenticity from a defunct authenticator (Champion Sports Collectables, Inc.), and the certificate of authenticity is of the variety that could be easily duplicated via photocopy, so unfortunately the signature cannot be considered authenticated.
A PSA-certified similar ball sold at Heritage Auctions in December 2019 for $630.
The signature on the ball that is the subject of this appraisal does appear to be consistent with other known Chamberlain signatures. In consideration of the factors noted, a Fair Market Value (pre-auction estimate) of this piece conditional upon signature authentication by a reputable third party such as PSA would be estimated at $600 to $700.