by 
d5kenn
ANSWERS: 2
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No story, just a printing mistake. But a printing mistake occasionally turns a common stamp into a highly prized trophy. The well-known 24-cent airmail stamp with the upside down plane of 1918 is a famous example. An unused regular copy of the stamp is worth something less than $100 in today's market. A stamp of the same issue with an inverted center can be sold for two thousand times that price. Only one sheet of one hundred of these stamps, affectionately known as the Inverted Jenny, was sold. The lucky buyer was William T. Robey of Washington, D.C.
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Here are several pages about the "upside down plane" stamp--much more info than can be summarized!: http://www.glassinesurfer.com/f/gsinvertedjenny.shtml
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