1931 (8.8-1.9.) Flight cover from List, Germany over Iceland (franked 50ä airmail), Greenland, Canada (franked 1c KGV) to Chicago (franked 2c von Steuben), by Wolfgang von Gronau with his crew to test this route with the Dornier Flying Boat "Grönland Wal", signed by the pilot with flight cachet above, very fine and a scarce airmail cover.
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