The 2006-2007 U.S. Mint 50 State Quarters Proof Sets are a collection of uncirculated coins minted in San Francisco, featuring a proof strike type. These sets include the original box and Certificate of Appreciation issued by the U.S. Mint. The coins have a denomination of 25 cents and are a great addition to any coin enthusiast's collection, representing all 50 states of the United States.
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