The William III halfpenny appears with various distinct types of engraving of the king's head, Britannia, and the inscriptions, with the quality getting worse as the reign wore on. The coins were copper, weighing 8.9 to 11.5 grams, with a diameter of 28–29 millimetres. The king's effigy on the obverse faced right, with the inscription GVLIELMVS TERTIVS – William the Third. Britannia appears on the reverse with the inscription BRITANNIA and the date normally in the exergue beneath Britannia. Coins were produced each year between 1695 and 1701.