Silver center cent
The Silver center cent is an American pattern coin produced by the United States Mint in 1792. As a precursor to the large cent it was one of the first coins of the United States and an early example of a bimetallic coin. Only 12 original examples are known to exist, of which one is located in the National Numismatic Collection at the Smithsonian Institution. Two more specimens (Morris and California) exist but contain fabricated plugs added after minting.
Due to their rarity and historical significance Silver center cents are highly prized by collectors with one graded PCGS MS61 being sold in an online auction in April 2012 for $1.15 million.