A 1918 U.S. 24-cent airmail stamp became rare and valuable because its airplane image was printed upside down.
Sources
- Philately - Notable Stamps, Collections | Britannica (britannica.com)
- https://postalmuseum.si.edu/topics/inverted-jenny (postalmuseum.si.edu)
- https://www.smithsonianmag.com/smithsonian-institution/how-inverted-jenny-24-cent-stamp-came-be-worth-fortune-180969090/ (smithsonianmag.com)
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