The world’s rarest postal stamp, the 1856 British Guiana One-Cent Magenta, will go on display at the National Postal Museum in Washington starting in April, the Smithsonian Institution said on Thursday.
The world’s rarest postal stamp, the 1856 British Guiana One-Cent Magenta, will go on display at the National Postal Museum in Washington starting in April, the Smithsonian Institution said on Thursday.