Collectible coins, particularly within the context of the United States, can encompass a variety of types, including patterns, which are trial pieces created to test potential designs and compositions for future coinage. The 1871 P-20 pattern coin is a notable example, as it was struck during a time of experimentation with designs for the cent. Patterns are often highly sought after by collectors due to their rarity and the insight they provide into historical minting processes. These coins can exhibit unique features not found on circulating currency, making them valuable both for their artistic merit and their place in numismatic history.

Item Denomination Series Year Mint
1871 P$20 Copper J-1176 BN P$20 Patterns 1871 Philadelphia