In 1939, our National Passtime celebrated it's first hundred years. As part of the festivities, the US Postal Service offered a great variety of first day covers depicting great moments in baseball history. Presented are six covers dated June 12, 1939 and postmarked Cooperstown , New York. They incude the earliest known baseball print, John Mcgraw HOF plaque, Edward L. Grant ( 1st big league player to die in action WW1) and three variations on the Centennnial logo designed for the event. All are in excellent condition and make a great display lot.