Predecimal Halfcrown Diameter1697 – 1698: 33mm1816 – 1967: 32.3mm Weight1697 – 1698: 15.10g1816 – 1967: 14.14g Composition1697 – 1919: 0.925 silver1920 – 1946: 0.500 silver1947 – 1967: cupro-nickel Click here to download the QR code for this page