Collectible coins encompass a variety of types, including commemorative, bullion, and historic coins. In the United States, the 1 One Dollar coins, such as the Eisenhower and Susie B. Anthony series, are significant for collectors. Washington Quarters, first minted in 1932 to honor George Washington's 200th birthday, have become popular among numismatists, especially the 1979 variety, which is part of a larger set that includes notable design variations and errors. Collectors often seek coins based on rarity, condition, and historical importance.