The 1955 Double Die Penny was a minting error, resulting in a doubled image. Only a few exist, making them highly sought after by collectors.
The 1933 Double Eagle gold coin was never officially released for circulation due to the Gold Reserve Act. A few were stolen and later recovered.
The 1943 Copper Penny was mistakenly made with copper instead of steel due to wartime shortages. Only a few are known to exist.
The 1974-D Aluminum Penny was a trial piece that was never approved for circulation. Only a few examples were produced and most were destroyed.
The 2000-P Sacagawea Dollar with a mule error features the obverse of a Sacagawea Dollar paired with the reverse of a State Quarter, making it a rare find.
The 1913 Liberty Head Nickel is one of the rarest and most valuable coins in the world. Only five are known to exist, with one selling for over $3 million.