This official Spalding NBA Game Ball has been signed by 14 all-time great Celtics, with highlights including Bill Russell, Red Auerbach, Bill Sharman, Bob Cousy, Satch Sanders, and KC Jones, among others. All the signatures are done in black sharpie and rate between 7 and 9. Also written on the ball is the limited edition number 572/1000. Comes with a LOA from JSA.