1849 Liberty Double Eagle US Coin 1849 3D print model

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1849 Liberty Double Eagle Value: 20 United States dollars Mass: 33.431 grams Diameter: 34.1 mm (1.342 inches) Composition: 90% gold, 10% copper Gold: .96750 troy ounces Years of minting: 1849–1907 Only one gold impression of the 1849 Liberty Double Eagle is known to exist, marking it technically as a pattern or experimental coin that represents the first double eagle ever struck by the United States Mint. The single known coin was never traded publicly and instead was sent directly to the Philadelphia Mint's cabinet after its mintage, likely on December 22, 1849. In 1909, J.P. Morgan offered an extraordinary sum of $35,000 for the coin, a figure that would have been unheard of at the time. Today, the single known 1849 Double Eagle resides in the National Numismatic Collection at the Smithsonian Institution. Rumor has it that one or two more gold impressions were also struck, but none of these coins have been located. If one were to resurface after 150 years, it would rank as one of the greatest numismatic discoveries ever made and could potentially be the most expensive coin in the world. In addition, a single brass impression was known during the 19th century, struck at a later date than the original coin, but that specimen has not been seen since 1892.