Bill Walton signed Portland Trail Blazers Sports Illustrated photo vs Kareem JSA

Sports Illustrated book full page action photo of legendary Portland Trail Blazers Hall of Famer Bill Walton battling Kareem Abdul-Jabbar for a rebound, autographed in thick black Sharpie by Walton only. Authenticated by JSA with their matching numbered sticker on the photo and certificate of authenticity card. ONLY ONE AVAILABLE FOR SALE.