The idea of rare dimes or a bicentennial quarter being worth $90 million each and still in circulation is more likely a myth or an exaggerated story rather than reality.
1894-S Barber Dime The 1894-S Barber Dime is one of the rarest and most valuable U.S. coins. Only 24 were minted, and fewer than 10 are known to exist today.
1916-D Mercury Dime The 1916-D Mercury Dime is a key date in the Mercury Dime series due to its low mintage of just 264,000.
1873-CC No Arrows Seated Liberty Dime This dime is extremely rare due to its limited mintage and the fact that most were melted down. Only one known example exists today.
1976 Bicentennial Quarter (with special attributes) While most Bicentennial Quarters are not particularly valuable, certain error coins or those struck in silver as part of special mint sets can be more valuable.
Value: Silver Bicentennial Quarters in high grades might be worth $20 to $50, and certain error coins can be worth several hundred dollars to a few thousand, depending on rarity and condition.