Bi-metallic Errors:

Ring:

Ring Struck with Dies From another Country

This 2000-P Sacagawea dollar error was struck on copper-nickel ring intended for a Ghana 100 Cedis. The 100 Cedis is a bimetallic coin with a brass center framed by a copper-nickel outer ring.  The ring almost certainly came from the Royal Canadian Mint, mixed in with a shipment of Sacagawea planchets.  During periods of peak demand, the RCM processed dollar planchets for the U.S. Mint. The diameter of the ring was close enough to the standards of a Sacagawea dollar to escape the Mint riddlers.