Gems of American Philately

1918: The Inverted Jenny

24c Curtiss Jenny inverted block of four, 1918
24c Curtiss Jenny inverted block of four, 1918.
Loan from William H. Gross.
This upside-down blue plane within a red frame is the most famous U.S. stamp and one of the world’s most famous printing errors. Only one misprinted sheet of 100 stamps was sold.

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