signed in blue marker by five players who hit grand slams for the Yankees in the World Series. The jersey has been signed by Yogi Berra, Joe Pepitone, Bill Skowron, Bobby Richardson, and Tino Martinez. With the exception of Berra, each player has added an inscription relating to their historic home run. . Sport: Baseball,Player: Yogi Berra,Signed: Yes,Original/Reprint: Original,Autograph Authentication: James Spence Authentication (JSA),Product: Jersey,Team: New York Yankees,Country of Origin: United States