Collectible coins are categorized based on various factors such as historical significance, rarity, and condition. The United States of America has issued numerous coins, including the One Dollar denomination, which features various designs over the years. The Coronet Head Cents, minted from 1816 to 1839, include the specific 1818 issue produced in Philadelphia. This series is notable for its distinctive portrait of Liberty and is sought after by numismatists for its aesthetic and historical value.