2008,KM-427, Schön-425 Country United States Year 2008 Value 1 Dollar (1 USD) Metal Manganese-brass (Cu 88.5%, Zn 6%, Mn 3.5%, Ni 2%) Weight 8.1 g Diameter 26.5 mm Commemorative issue Presidential dollar coin program Obverse John Quincy Adams, 6th President of the United States from 1825 to 1829 (son of 2nd U.S. President John Adams) Lettering: JOHN QUINCY ADAMS DE 6th PRESIDENT 1825-1829 Rev ...