1BTC brass SpecificationYear: 2011-2013 Denomination (BTC): 1 Metal: brass Mintage:Series-1 2011 5993 Series-2 2011 516 Series-2 2012 6740 Series-2 2013 5407 Weight (g): 6.7 Thickness (mm): 1.8 Diameter (mm): 29Design, Manufacturer: USA Photo Prev Next