Collectible coins encompass various types, including historical, commemorative, and bullion coins. The Seated Liberty Half Dollar, minted from 1839 to 1891, showcases Lady Liberty seated and is a popular choice among numismatists. The Four Dollar Gold Coin, also known as the Stella, was issued briefly in the 19th century and is notable for its unique design and low mintage, making it highly sought after by collectors. In the United States, the allure of collectible coins often lies in their historical significance, artistry, and potential investment value.