The first U.S. stamped enveloped was issued in 1853
- First commemorative stamped enveloped in 1876 to celebrate the Philadelphia Centennial Exposition
- Austria issued the first postal card in 1869
- Bavaria issued the first reply card – two postal cards joined together, one for the original message and the second for reply
An aerogramme is a letter sheet with gummed flaps, imprinted with an indicium, and issued for air mail use. They became popular following World War II, but got their start in 1870 France as a method to get mail out of Paris by balloon during the Franco-Prussian War.
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