
The 2003 United States Quarter Proof Set is a numismatic collection that includes proof versions of the circulating quarters issued in 2003. This set typically features five quarters, each representing a different state as part of the 50 State Quarters Program. In 2003, the state quarters honored Illinois, Alabama, Maine, Missouri, and Arkansas. Proof sets are known for their high-quality finishes, with coins featuring mirror-like surfaces and sharp details.