Collectible coins are often categorized based on their historical significance, rarity, condition, and demand among collectors. The United States has produced numerous notable coins, including the Four Dollar gold piece, which was minted in 1850 and known for its unique design. The Coronet Head cents, minted from 1816 to 1857, feature Lady Liberty and are a popular choice among numismatists. The 1822 Coronet Head cent is particularly valued for its rarity and historical context. Collectors often seek coins with specific attributes, making certain years and types more desirable in the marketplace.