This is an Official National League (Harridge) Baseball that has been hand signed by 21 members of the 1936 World Champion New York Yankees. Signatures include Lou Gehrig, Joe DiMaggio, Red Ruffing, Bill Dickey & Tony Lazzeri. This was Joe DiMaggio's Rookie season. The Lefty Gomez is deemed a clubhouse autograph. The autograph has been authenticated by PSA/DNA. It comes with their full page certificate of authenticity.