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[Demonstration flight air mail cover addressed to William E. Boeing from Douglas Aircraft Company, October 1, 1946] (Item)

Demonstration flight air mail cover addressed to William E. Boeing, Seattle, Washington, from the Douglas Aircraft Company, Santa Monica, California, October 1, 1946.Stamped cachet: "Demonstration flight - Flying Post Office - En route - Los Angeles - New York - Boston - U.S. Air Mail."