After the mint moved from the Tower of London to Tower Hill the production of gold and silver coins took precedence over copper. The production of copper coins did not resume until the reign of King George IV (1820–1830), when farthings were produced in 1821. The issue of new halfpennies did not happen until 14 November 1825 as a result of a disagreement between the egocentric designer Benedetto Pistrucci and the authorities, which resulted in William Wyon being invited to design the coins instead. This delay may be regarded as a good thing, as Wyon's designs are generally considered among the most elegant British coins. The George IV halfpenny was produced between 1825 and 1827, weighed 9.1–9.5 grams, with a diameter of 28 millimetres. The obverse shows a left-facing laureated bust of King George IV with the inscription GEORGIUS IV DEI GRATIA date, while the reverse shows a right-facing seated helmeted Britannia with a shield and trident, with the inscription BRITANNIAR REX FID DEF. Wyon's preference was to put the date under the king's bust, and to put the rose, thistle, and shamrock in the exergue underneath Britannia where the date commonly appeared before.