Collectible coins encompass a wide range of numismatic items, including historical coins, patterns, and commemoratives. In the United States, one notable example is the 1 One Dollar coin, which has various designs and historical significance. Patterns are experimental coins created to test new designs or technologies; for instance, the 1759 patterns produced in Philadelphia represent early American coinage attempts. Collectors often seek these items for their rarity, historical context, and aesthetic appeal.