Collectible coins encompass various types, including patterns and trial coins, which are typically produced as test pieces or prototypes for proposed designs. In the context of the United States, the 1806 fifty-cent coin is noteworthy, representing an era when coinage design was evolving. Patterns are often unique and limited in production, making them highly sought after by collectors, while trial coins serve as an essential part of the minting process to evaluate potential designs and materials.

Item Denomination Series Year Mint
United States of America 1806 Philadelphia Patterns & Trial Coins 50¢ 50¢ (Fifty Cents) Patterns & Trial Coins 1806 Philadelphia