1991,KM-228 Country United States Year 1991 Value Half Dollar = 50 Cents (0.50 USD) Metal Copper-nickel clad Copper Weight 11.34 g Diameter 30.6 mm Commemorative issue 50th Anniversary of Mt. Rushmore Obverse Mount Rushmore Memorial, the world’s largest carved stone sculpture. A sunburst appears in the background. Lettering: LIBERTY IN GOD WE TRUST 1991 MOUNT RUSHMORE Engraver: Marvel Jovine ...