FDC with a cachet honoring the first air mail flight of the Jupiter balloon, signed on the front in ink and felt tip by nine members of the Aviation Hall of Fame: Grover Loening, Donald Douglas, Sr., Igor Sikorsky, Juan Trippe, Ira Eaker, John Macready, Carl Andrew Spaatz, James Doolittle, and Eddie Rickenbacker. In fine condition. Desirable signatures on their own, a collection of nine famous aviators on one cover is rare. RRAuction COA.
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