The unique one-cent British Guiana magenta stamp, issued in 1856, sold at auction in 1970 for $280,000.
Sources
- Philately - Notable Stamps, Collections | Britannica (britannica.com)
- https://postalmuseum.si.edu/exhibition/british-guiana-one-cent-magenta/timeline-of-a-rarity (postalmuseum.si.edu)
- https://www.si.edu/newsdesk/releases/world-s-rarest-stamp-now-display-national-postal-museum (si.edu)
- https://www.linns.com/news/auctions/2014/june/unique-british-guiana-1-magenta-stamp-sells.html (linns.com)
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