2015 United States Quarters America the Beautiful Silver Proof Set - 5 pc set . The Set contains 5 90% Silver America the Beautiful Proof Quarters honoring Homestead National Monument of America (Neb.), Kisatchie National Forest (La.), Blue Ridge Parkway (N.C.), Bombay Hook National Wildlife Refuge (Del.), and Saratoga National Historical Park (N.Y.). All coins were struck at the United States Mint at San Francisco in 90 percent silver. The obverse (heads side) of the coins bear John Flanagan’s 1932 portrait of George Washington.. About 1oz of pure Silver