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British Guiana 1c magenta

The British Guiana 1c magenta is regarded by many philatelists as the world's most famous rare stamp. It was issued in limited numbers in British Guiana in 1856, and only one specimen is now known to exist. Wikipedia
Country of production: British Guiana (now Guyana)
Date of production: 1856
Face value: 1c
Location of production: Georgetown
No. in existence: 1