0.7734 oztIn order to conform to the Coinage Act of 1837, the Morgan dollar contained ninety percent silver and ten percent copper, measured 38.1 millimetres (1.50 in) in diameter and weighed 412.5 grains (26.73 g). Thus the pure silver content was 371.25 Troy grains = 24.057 g; 0.7734 ozt.