Curtis Jenny Biplane
This stamp was issued December 16, 1918 and is part of the first Airmail stamp series. As you can see there is no text on the stamp saying "Air Mail." Nevertheless, the purpose of the stamp is clear from the design itself which incorporates an engraving of the Curtis Jenny Biplane. In fact in chronological order, the first "Air Mail" stamp was issued on May 15, 1918. Color and denomination differ for the above, but the design is the same.
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