Collectible coins encompass a range of types, including numismatic coins, commemorative coins, and bullion coins. In the United States, collectible coins often feature significant historical events or figures, with trial coins representing experimental or preliminary designs not intended for general circulation. An example of notable trial coins includes the 1942 Philadelphia Mint trials, where various patterns were tested for potential new currency designs during World War II. These coins are sought after by collectors due to their unique characteristics and historical significance.

Item Denomination Series Year Mint
1942-P (Philadelphia) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1942 Philadelphia
1942-P (Philadelphia) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1942 Philadelphia