Collectors are shelling out over $500,000 for the rare 1975 No S Proof Roosevelt Dime, thanks to its extreme rarity and unique minting error. Only two such dimes exist, making them one of the most valuable modern U.S. coins. Discover why this dime is so special, how to identify valuable coins, expert investment tips, and comparisons with other rare error coins. Includes official links and practical advice for beginners and professionals alike.