Jocko Conlan was an American baseball umpire who worked in the National League (NL) from 1941 to 1965. He had a brief career as an outfielder with the Chicago White Sox before entering umpiring. He umpired in five World Series and six All-Star Games. He was elected to the Baseball Hall of Fame in 1974 by the Veterans Committee. Jocko Conlan has hand signed this HOF Plaque 3.5x5.5 Postcard. JSA Authentication Sticker #LL60416 and JSA Certificate of Authenticity.