Hall of Famer Dave Cowens has personally signed this Boston Celtics Vertical 8x10 Photo-Dave Cowens is one of four players to lead his team in all five major statistical categories for a season which includes points rebounds assists blocks and steals. He accomplished this such feat durng the 1977-78 season. Cowens during his NBA career he averaged 17.6 points per game he was a seven time All-Star was named to the All-NBA Defensive First Team in 1976 and he was also a part if the Celtics 1974 and 1976 NBA Championship teams. This Dave Cowens autograph is Guaranteed Authentic by Steiner Sports and include a Steiner Sports Certificate of Authenticity and an accompanying tamper-proof Steiner Hologram. The Steiner Seal Means Its Real.