Collectible coins encompass a variety of types, including historical, commemorative, and bullion coins. The United States has a rich history of coinage, with notable examples such as the Half Cent, which was produced until 1857. Hawaii has its own unique numismatic history, particularly with the issuance of coins during its kingdom era, such as the 1879 Hawaiian coinage. Collectors often seek coins based on rarity, historical significance, and condition, contributing to their market value.