Collectible coins encompass a variety of categories, including patterns, which are experimental designs created to test the viability of new coinage before mass production. In the context of the United States of America, the 1866 P5c pattern coin is notable for its intricate design and historical significance, representing a key period in U.S. minting history. Patterns often have limited mintage and are highly sought after by collectors due to their rarity and connection to numismatic innovations.

Item Denomination Series Year Mint
1866 P5c Nickel J-473 P5c Patterns 1866 Philadelphia
1866 P5c Washington, Nickel J-461 P5c Patterns 1866 Philadelphia