The 1837 Halfpenny obverse features the bare head of King William IV facing right. The surrounding legend reads: 'GULIELMUS IIII DEI GRATIA', with the date below. The UK 1837 Halfpenny reverse shows Britannia seated facing right, holding a trident, hand resting on a shield. The legend reads 'BRITANNIAR: REX FID: DEF:', with a rose, thistle, and shamrock below.Originally the halfpenny was minted in copper, but after 1860 it was minted in bronze. There are many rare and collectible Halfpenny coins. Even some of the most recent United Kingdom decimal coins are sought-after by numismatics or coin collectors.