Collectible coins encompass a wide range of numismatic items, including patterns and trial coins, which are experimental pieces struck to test designs or production methods. In the context of the United States, the 1851 One Cent Penny pattern coins produced in Philadelphia represent an intriguing example of early American coinage experimentation. These trial coins often feature unique designs and are sought after by collectors for their rarity and historical significance, making them valuable additions to numismatic collections.

Item Denomination Series Year Mint
United States of America 1851 Philadelphia Patterns & Trial Coins 1¢ 1¢ (One Cent, Penny) Patterns & Trial Coins 1851 Philadelphia