£100
NORTH ATLANTIC AIR SERVICES - EXPERIMENTAL FLIGHTS: 31 July 1927 env. flown on the 1st experimental flight by Clarence D Chamberlain from SS Leviathan to Teterboro airport 20 Aug. 1927; env. flown on the 2nd experimental flight by Lt. Clarence H Schildhauer from New York to SS Leviathan which unfortunately failed, h. s. on reverse "AIR MAIL FLIGHT FAILED/S.S. LEVIATHAN"; 12 June 1929 env. flown from New York to SS Leviathan at sea with large red cachet; and env. of 9 June 1929 from New York to SS Leviathan with blue "Delivery and Pickup/POSTPONED" h..s. and illustrated cachet on reverse. (4 covers)Cross Reference:
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