Lot no. 430

1931, First Flight Manila to Southern Islands by U.S. Army Squadron from Stotsenbug, cover with all appropriate postmarks and special green cachet "VIA U.S. ARMY AIR SERVICE AIR MAIL MAY 11 1931 * PIONEER FLIGHT *", the same cachet struck on the reverse but in blue, with arrival mark, signed by the pilot, very fine, rare (AAMC.-Nr. 44)