1817 King George III Silver Sixpence Coin – Great Britain. For Sale – 1817 King George III Silver Sixpence Coin – Great Britain Diameter – 19 mm Weight – 2.51 grams Metal – Silver The coin in the photos is the coin you will receive. Diameter – 19 mm. Weight – 2.51 grams. The coin in the photos is the coin you will. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. 1974 Luxembourg 10 Francs Coin. 1921 Sweden 2 Ore Coin. 1923 France 2 Francs Coin.