Philippines 1928 16c Dewey L.O.F. Overprint (C24) tied by Del Carmen, 1-21-32, duplex on U.S. Army Air Service Flight #73 (old #69) from Del Carmen to San Miguel, 1-21, and on to Fort Stotsenburg with 1-21 backstamp. Neat cover with purple and 2 green Special U.S. Army Air Service cachets type 45 and blue "VIA U.S. ARMY AIRPLANE" service handstamp in blue carried during military manoeuvers. Signed by Brig. General H. J. Brees. Very Scarce & Colorful Pioneer Flight cover, only 55 were flown and only 13 of these were signed by the General! A Choice cover replete with markings and history!