The three-dollar coins, specifically the United States Three Dollar Gold Coin, were minted primarily during the years 1854 to 1889, with the 1866 privately issued patterns being among the most significant in the series. These patterns were created as prototypes for potential circulation and often possess unique designs that reflect the era's artistry. The 1866 patterns are particularly notable for their rarity and historical significance, as they were not issued for regular circulation but instead serve as collectibles, appealing to numismatists interested in U.S. minting history and gold coinage.

Item Denomination Series Year Mint
United States of America 1866 N/A Privately-issued "Patterns" $3 $3 (Three Dollars) Privately-issued "Patterns" 1866 N/A