The Superbird variety is a proof Washington Quarter with a letter 'S' on the eagle's chest on the reverse side of the coin. Most experts believe that a Mint employee intentionally added the 'S' mint mark on the eagle's chest in honor of Superman! Very little of these have every been discovered, making it a difficult to locate variety with low overall production. A must for all Variety collectors - or anyone who likes unusual, hard to find coins!

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