Collectible coins can include a variety of types, such as commemorative coins, bullion coins, and historical or antique coins. In the United States, the "One Dollar" coins have a rich history, with the Gold Dollar introduced in 1849 and issued in various designs until 1889. The 1852 Gold Dollar is notable for its small size and the use of gold, appealing to both investors and collectors. Collectible coins often gain value based on rarity, historical significance, and condition.