Flown airmail cover carried on the first flight of the Douglas D-558-2 Skyrocket on February 4, 1948, signed in blue ballpoint by the pilot, "John F. Martin." The printed text reads: "Carried on First Flight, Douglas Transonic 'Skyrocket,' First Airplane to Combine Use of Jet and Rocket Power, Muroc, California, Feb. 4, 1948, Pilot: John F. Martin." In fine condition.
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