Collectible coins, particularly in the context of the United States, include a wide variety of types such as patterns and trial coins. Patterns are experimental issues created to test designs or compositions before official minting, while trial coins are struck to evaluate new processes or materials. The 1827 Quarter, for instance, might feature unique design elements that differentiate it from standard circulation coins. These types are sought after by collectors due to their rarity and historical significance.

Item Denomination Series Year Mint
United States of America 1827 Philadelphia Patterns & Trial Coins 25¢ 25¢ (Twenty Five Cents, Quarter) Patterns & Trial Coins 1827 Philadelphia