Collectible coins, also known as numismatic coins, can include a variety of types such as commemoratives, bullion, and rare coins. In the context of the United States, collectible coins often feature historical significance and can include private and regional issues that became prominent after 1776, along with official U.S. Mint issues. The U.S. one-dollar coin has seen various designs and series since its introduction, particularly post-1790. Collectors value these coins not only for their face value but also for their rarity, historical importance, and condition.