Collectible coins include various types such as patterns and trial coins, which are often produced in limited quantities for testing designs or minting processes. The 1866 One Cent Penny is a notable example from the United States, struck in Philadelphia. Patterns are experimental coins that may not have been intended for regular circulation. These coins can be highly sought after by collectors due to their rarity and historical significance.

Item Denomination Series Year Mint
United States of America 1866 Philadelphia Patterns & Trial Coins 1¢ 1¢ (One Cent, Penny) Patterns & Trial Coins 1866 Philadelphia
United States of America 1866 Philadelphia Patterns & Trial Coins 1¢ 1¢ (One Cent, Penny) Patterns & Trial Coins 1866 Philadelphia