This is a Wilson Official NBA Leather Game Ball Basketball that has been hand signed by 11 members of the 1977-78 Seattle Supersonics Team. Signatures include Dennis Johnson, Fred Brown, Gus Williams, Jack Sikma, Wally Walker, Paul Silas, Joe Hassett, Al Fleming, Marvin Webster and John Johnson. This item has been certified authentic by Beckett Authentication (BAS) and comes with their tamper-proof hologram and matching full-page certificate of authenticity.