Collectible coins encompass a diverse range of types, including patterns and trial coins. Patterns are experimental designs created to evaluate new coin concepts before final production. Trial coins, such as those minted in 1866, were produced to test specific design or production methods and are often characterized by their rarity and unique features. The United States Mint has a rich history of producing both patterns and trial coins, making them highly sought after by collectors due to their historical significance and limited availability.

Item Denomination Series Year Mint
1866-- (Unknown) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1866 Unknown
1866-- (Unknown) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1866 Unknown
1866-P (Philadelphia) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1866 Philadelphia
1866-P (Philadelphia) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1866 Philadelphia