1918, December 9, Jahn Aerial Mail Dropping Apparatus. Purple boxed handstamp with matching "First Aerial Plane Non-Stop Mail Delivery Washington D.C., Official Experiment" circular datestamp on legal-size cover to Minneapolis Minn., one strike cancels 16c Green (C2) and 6c Orange (C1), also with "Washington D.C. Dec. 5 1PM 1919" duplex datestamp, endorsed "Special Delivery" at lower left, Very Fine, with original typed signed contents starting "This letter is a souvenir of the first official experiment in dropping mail bags from airplanes by use of the Jahn Parachute" with additional explanation of the flight, Very Fine, only 134 prepared

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