Collectible coins, particularly within the United States, include various types such as the 10 Cents Dime, which has been produced in numerous designs since its inception. Patterns and trial coins, notably from 1866, represent experimental designs or compositions, often struck in limited numbers at the Philadelphia Mint. These coins are highly sought after by collectors due to their rarity and historical significance. The 1866 trial coins are especially valuable, providing insight into the evolution of U.S. coinage.

Item Denomination Series Year Mint
United States of America 1866 Philadelphia Patterns & Trial Coins 10¢ 10¢ (Ten Cents, Dime) Patterns & Trial Coins 1866 Philadelphia