Collectible coins encompass a wide range of types, including patterns, which are trial strikes created to test designs before mass production. The 1866 patterns are particularly notable as they represent experimental designs for U.S. coins during that era. These coins are highly sought after by collectors due to their rarity and historical significance within American numismatics. The United States Mint produced various patterns, often leading to unique variations that can fetch substantial value in the collector market.

Item Denomination Series Year Mint
1866 P$3 Nickel J-543 P$3 Patterns 1866 Philadelphia