Collectible coins, often referred to as numismatic coins, include various types that hold value beyond their face value due to factors such as rarity, historical significance, and condition. In the United States, the One Dollar coins have featured notable designs, including the Sacagawea and Presidential series. Roosevelt Dimes, minted since 1946, commemorate President Franklin D. Roosevelt and are notable for their 90% silver content in earlier releases, specifically those minted in 1946-1964. Collectors focus on specific years, mint marks, and special editions to enhance their collections.