10 Dollars - Elizabeth II Treskilling Yellow

The Treskilling Yellow is arguably the most famous error stamp in philatelic history — a Swedish 1855 three-skilling banco printed in yellow when the color should have been blue-green, with only a single example known to exist. It last sold at auction in 2010 for approximately 2.3 million Swiss francs. This coin is one of a growing genre of numismatic tributes to iconic philatelic rarities, struck in fractional gold as a collector novelty rather than a circulating issue.