Beautiful 1980 Celtics team signed basketball on a Lawrence F. O'Brien official Wilson NBA ball. This example contains 15 signatures including Pete Maravich, Larry Bird (R), Red Auerbach, Dave Cowens, Eric Fernsten, Bill Fitch, K.C. Jones, and M.L. Carr. Signatures generally rate a 6 out of 10 and are written in black marker. A fine example of a Bird rookie ball.