£80 - £100
1927 (Aug 20) Cover to England franked Air 20c, endorsed "Per Leviathan first trip air mail", intended to be flown by the U.S Navy and dropped on the "Leviathan" part way across the Atlantic to accelerate the mail; however the pilot Lt. C.H Schildhauer was unable to find the ship in fog and returned to New York with the mail, the cover twice backstamped "AIRMAIL FLIGHT FAILED TO / SS LEVIATHAN".
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