Collectible coins, especially in the context of U.S. numismatics, include various types, such as patterns, which are trial strikes created to test designs before mass production. The 1861 Philadelphia coin patterns are particularly notable, as they were produced during a tumultuous period in U.S. history, reflecting both artistic innovation and the uncertainties of the Civil War era. These coins often feature unique designs and limited mintage, making them highly sought after by collectors. The designation "P" may refer to the Philadelphia mint mark, indicating the place of production.

Item Denomination Series Year Mint
1861 P$2 1/2 Copper J-282 BN P$2 1/2 Patterns 1861 Philadelphia