From 1817 until 1919, all British silver coins had a fineness of .925; i.e. 92.5% silver or sterling silver. In 1920 the silver content was reduced to 50%. In 1947, what were silver coins, were subsequently made from a copper/nickel alloy - no silver at all.No circulating British coin has contained any silver since 1946. SO HERE"S YOUR ANSWER, the coin is 50 % SILVER!