Collectible coins from the United States, particularly the 1856 Pattern coins minted in Philadelphia, represent unique pieces of numismatic history. Patterns are experimental coins struck to test designs or new minting techniques before official production. The 1856 Pattern coins, such as the P1 2c, are significant for their rarity and the insight they provide into the evolution of U.S. coinage. Collectors highly value these coins for their historical importance and limited availability.