The British Guiana 1 cent Stamp

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The British Guiana 1 cent Magenta is widely regarded as the rarest and most valuable stamp in the world. The stamp shows a sailing ship with the Latin motto "Damus Petimus Qui Vicissim" (We give and expect in return) surrounding it. It was originally printed as a temporary local issue and was used for newspaper postage. There is only a single known example in existence, and it has reached tens of millions of dollars at auction. The images is from FineArtAmerica.com