Collectible coins, such as the United States quarter, encompass various categories, including patterns and trial coins. The 1866 quarter, for example, represents a significant historical piece as it was part of the initial transitions in U.S. coinage. Patterns are experimental designs created to test new concepts before final production, while trial coins are struck to assess feasibility and design aesthetics. Collectors often value these items for their rarity, historical context, and artistic significance.

Item Denomination Series Year Mint
United States of America 1866 Philadelphia Patterns & Trial Coins 25¢ 25¢ (Twenty Five Cents, Quarter) Patterns & Trial Coins 1866 Philadelphia