Inverted Jenny

Topical Reference Page
Inverted Jenny stamp

The "Inverted Jenny" is a misprinted U.S. postage stamp showing an inverted image of a blue airplane. The error occurred on the 24-cent airmail stamp of 1918. Only one sheet of one hundred inverted center stamps was sold, and no other examples have been discovered.

1918 “Jenny” airmail stamp
A stamp in one color can be elegant, but the Post Office and the public soon looked for the visual interest of a second color of ink. The first U.S. “bicolor” postage stamps with two colored inks were issued in 1869.
At the request of the Post Office, a very small number of die proofs have been deliberately printed by the Bureau of Engraving and Printing over the years to illustrate the error.

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