That’s a very valuable ball! The 1972 Dolphins went undefeated and beat the Redskins in the 72 Super Bowl, though the ball could be from 1973. Along with Czonka and Griese should have signatures of Earl Morrall, Mercury Morris, Bob Kueschenberg, Jim Kiick, among many others. Morrall should have started and played the 72 Super Bowl for the Dolphins. Griese was injured for a big part of the season ( played the first 5 games) and Earl Morrall took them to the Super Bowl, winning 11 straight games but didn’t get to play in the Super Bowl. A slight that angers me even 50 years later. IMO Morrall was the greatest back up NFL quarterback ever!