Collectible coins, particularly in the context of the United States, often include specific rare issues such as patterns, which are trial coins produced to test designs and dies before mass production. The 1870 Philadelphia Mint patterns are notable examples, marking a significant year in U.S. numismatic history. These coins may include denominations like the 50 cent pieces (often designated as "P" for Philadelphia) and can be highly sought after due to their rarity and historical significance. Collectors value these coins not only for their potential investment returns but also for their aesthetic appeal and the story they tell about the era in which they were produced.

Item Denomination Series Year Mint
1870 P$2.50 Copper J-1026 BN P$2.50 Patterns 1870 Philadelphia