Four player signed baseball, all of the guys with defining moments in baseball history. Bill Mazeroski, known for hitting the only World Series Game 7 walk-off HR in 1960. Don Larsen, who pitched the only perfect game (and no hitter) in World Series history, doing so in game 5 of the 1956 World Series. Bobby Thomson and the "Shot Heard 'Round the World" in which he hit the winning 3-run HR for the Giants and helped them to clinch the 1951 pennant. The Johnny Vander Meer, the only player ever to throw consecutive no-hitters, coming only 4 days apart in 1938.