Collectible coins encompass various types, including patterns and trial coins, which are typically experimental pieces created to test designs, compositions, or minting techniques. In the United States, one notable example is the 1881 one cent penny pattern, which was produced in limited quantities and is sought after by collectors for its historical significance and rarity. These coins often feature distinctive designs that differ from regular issue coins, making them particularly valuable in numismatic circles.

Item Denomination Series Year Mint
United States of America 1881 Philadelphia Patterns & Trial Coins 1¢ 1¢ (One Cent, Penny) Patterns & Trial Coins 1881 Philadelphia