The USO Commemorative Dollar 1991 S is a beautifully crafted silver $1 coin minted in San Francisco. This proof coin has a fineness of 0.9 and features a commemorative design in honor of the United Service Organizations. It is uncirculated and comes with a Certificate of Authenticity from the United States Mint. This collectible coin is a special edition piece that celebrates the contributions of the USO to the military and community service.