Larsen pitched the sixth perfect game in MLB history, doing so in Game 5 of the 1956 World Series. It is currently the only no-hitter or perfect game in World Series history and is one of only two no hitters in MLB postseason history. He won the World Series Most Valuable Player Award and Babe Ruth Award in recognition of his 1956 postseason.
This Rawlings official MLB baseball was signed in black by Larsen and inscribed, "10-8-56." This baseball includes a JSA sticker and COA.