In 1866, the United States Mint produced trial coins known as patterns for the proposed three-dollar denomination. These trial coins, struck in Philadelphia, were created primarily for evaluation and not intended for circulation. The three-dollar coin featured designs by notable engravers and served as an exploration of potential coinage. Pattern coins from this era are highly sought after by collectors due to their historical significance and limited mintage.

Item Denomination Series Year Mint
United States of America 1866 Philadelphia Patterns & Trial Coins $3 $3 (Three Dollars) Patterns & Trial Coins 1866 Philadelphia