Collectible coins encompass a variety of types, including commemoratives, bullion, and historical coins. The United States has a rich numismatic history, with notable examples such as the one-dollar coins issued in various designs, including the Peace and Eisenhower dollars. Jefferson Nickels, minted starting in 1938, feature the profile of Thomas Jefferson and have become popular among collectors, especially with certain key dates and varieties such as the 1950-D and the War nickels (1942-1945) containing silver. Collectors often seek these coins for their historical significance, rarity, and potential investment value.