Pioneer Flights. 1931-46, nine covers, including one prepared for Airship ''Hindenburg'' 2nd NA Return Flight (departed on May 21 of 1936, while the cover was received on May 29), marked ''TOO LATE'', FFC St. Pierre - St. John's (1931), 3 different FDC of No.C3 and more, nice quality unit, mostly VF, Est. $200-$250 (Image)