Collectible coins encompass various categories, including historical pieces, commemorative issues, and patterns, which are coins struck as prototypes or for testing purposes. In the United States coinage context, the term "P 50P" refers to specific coins, such as the 1851 pattern coins, which were created to evaluate new designs or technology. The 1851 Pattern Die Trials represent an important aspect of numismatic history, showcasing the artistic and technological experimentation of the U.S. Mint. These coins are highly valued by collectors for their rarity and historical significance.

Item Denomination Series Year Mint
1851 P$50P Humbert Copper Pattern BN P$50P Patterns & Die Trials 1851 California