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The 1804 dollar is a dollar coin struck by the Mint of the United States; despite the date on the coin, none were struck before the 1830s. First created for use in special proof coin sets used as diplomatic gifts during Edmund Roberts' trips to Siam and Muscat, several restrikes were ordered in the 1840s. Today, only fifteen specimens are known to exist, divided into three slightly different classes. The Class III example pictured is one of only six known, and sold in a 2009 auction for USD $2,300,000.Coin: Mint of the United States; photograph: Heritage Auctions