Outstanding FDC with a cachet honoring the “100th Anniversary of Baseball” and George Herman ‘Babe’ Ruth, postmarked in Cooperstown, New York, on June 12, 1939, signed boldly in fountain pen, “Babe Ruth.” Designed and printed by W. G. Crosby, the cover boasts a 'real photo cachet' of Babe Ruth coaching for the Brooklyn Dodgers. The applied three-cent postage stamps honoring baseball's centennial were issued in conjunction with the dedication and opening of the National Baseball Hall of Fame in Cooperstown, New York, on June 12, 1939. Arguably the greatest player in baseball history—and certainly the most famous—Babe Ruth was elected to the Hall of Fame as a member of its inaugural class in 1936 and attended its dedication ceremonies in 1939. In fine condition, with some light toning and rippling. Encapsulated in a PSA/DNA authentication holder and accompanied by a full letter of authenticity from JSA.