Collectible coins, particularly those issued by the United States, can vary in type, value, and demand among collectors. The Three Dollar coin, often featuring designs celebrating important historical events or figures, is a notable collectible. Silver Eagles, specifically the American Silver Eagle, are popular among collectors and investors for their purity and iconic design. The 2018 American Silver Eagle features the classic Walking Liberty design, and its production is part of a series that has been issued annually since 1986, making it a sought-after item among numismatists.