“ These standards of weight and fineness are those still in force. At the same time was issued the half-sovereign, of weight in proportion. The weight of 9341⁄2 sovereigns is exactly equivalent to twenty Troy pounds, and the weight of each individual sovereign is calculated on this basis. The sovereign is eleven-twelfths pure gold and one-twelfth alloy, copper being usual. The light colour of early Australian sovereigns was due to the use of silver instead of copper. ”