2006 US Mint 50 State Quarters Proof Set in OGP with COA

The 2006 United States Quarter Proof Set is a numismatic collection that includes proof versions of the circulating quarters issued in 2006. This set typically features five quarters, each representing a different state as part of the 50 State Quarters Program. In 2006, the state quarters honored Nevada, Nebraska, Colorado, North Dakota, and South Dakota. Proof sets are known for their high-quality finishes, with coins featuring mirror-like surfaces and sharp details.