1. 1804 Draped Bust Silver Dollar: The 1804 Draped Bust Silver Dollar, often referred to as the "King of American Coins," is one of the rarest and most valuable coins in the world. Only 15 coins are known to exist, and they can fetch millions of dollars at auction.
2. 1913 Liberty Head Nickel: The 1913 Liberty Head Nickel is another extremely rare coin. Only five of these coins are believed to exist, and they are worth millions of dollars each.
3. 1894-S Barber Dime: The 1894-S Barber Dime is one of the rarest dimes in US history. Only 24 coins were minted, and they can sell for hundreds of thousands of dollars.
4. 1916-D Mercury Dime: The 1916-D Mercury Dime is another rare US dime. Only 264,000 coins were minted, and they are worth thousands of dollars each.
5. 1909-S V.D.B. Lincoln Cent: The 1909-S V.D.B. Lincoln Cent is one of the most famous and sought-after coins in US history. It was the first Lincoln Cent to feature the initials "V.D.B." of designer Victor David Brenner, which were later removed due to public outcry. Only 484,000 coins were minted, and they can sell for thousands of dollars.
These are just a few of the most valuable circulated US coins. There are many other rare and valuable coins that can be found in circulation, but these are some of the most notable and sought-after pieces.