1: The rarest coin is the 1933 Double Eagle, with only a few known to exist.

2: Another rare coin is the 1794 Flowing Hair Dollar, one of the first U.S. silver dollars.

3: The 1804 Silver Dollar is another rare coin, known as "The King of American Coins."

4: The 1787 Brasher Doubloon is a rare gold coin minted by Ephraim Brasher in New York.

5: The 1913 Liberty Head Nickel is a rare coin with only five known to exist.

6: The 1792 Birch Cent is a rare coin considered the first U.S. penny.

7: The 1943 Copper Penny is a rare coin accidentally minted in copper instead of zinc-coated steel.

8: The 1974-D Aluminum Penny is a rare experimental coin that was never released to the public.

9: The 2007 $1 Million Gold Buffalo Coin is one of the rarest coins ever minted, with only one in existence.