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The British Guiana One-Cent Black on Magenta | Three Treasures – Collected by Stuart Weitzman | 2021 | Sotheby's
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British Guiana 1856 4c Black/Magenta SG24 Very Fine & Fresh Looking Cut Square Example RPS Certificate| Empire Philatelists
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The British Guiana 1856 One-Cent Black on Magenta stamp set a world record at Sotheby's New York, June 17, 2014 | Philip Chasen Antiques
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British Guiana 1c Black on Magenta: 10 little known facts about the world's most expensive stamp - All About Stamps
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