1856 British Guiana One-Cent Magenta (Reverse Infrared)

Smithsonian's National Postal Museum
June 4, 2015
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Smithsonian's National Postal Museum

1856 British Guiana One-Cent Magenta photograph using an infrared filter

Infrared photographs taken at the Smithsonian National Postal Museum in 2014 revealed a four-leaf clover beneath the seventeen-point star.

Photo Credit: Smithsonian's National Postal Museum