Silver Britannia Coins
They weigh 31.21 grams and measure 38.61 mm in diameter. The Silver Britannia Coins had a millesimal purity of 958 from 1997 to 2012 (95.8% Britannia silver). 32.45 grams in total weight, 40.00 mm in diameter. Ever since a silver proof set was made available in 1997, silver Britannias have been released annually.