First day cover honoring the centennial of baseball, postmarked at Cooperstown on June 12, 1939, signed in fountain pen, "Walter Johnson." In fine condition. Accompanied by a full letter of authenticity from JSA. This three-cent postage stamp honoring baseball's 100th anniversary was issued in conjunction with the dedication and opening of the National Baseball Hall of Fame in Cooperstown, New York, on June 12, 1939. One of the greatest pitchers in the history of the game, Walter Johnson was elected to the Hall of Fame as a member of its inaugural class in 1936. Encapsulated in a PSA/DNA authentication holder.
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