The first reverse (1828 - 1837), designed by William Wyon, features the figure of Britannia - the female personification of Great Britain; she is seated facing right, wearing a Corinthian helmet pushed back to reveal her face, resting her right hand on a shield bearing a saltire of arms, and holding a trident in her left hand. In the exergue, a rose, a thistle and a shamrock combined - the floral symbols of the constituent parts of the United Kingdom, respectively England, Scotland and Ireland.
The design is identical to that of the farthing, halfpenny and penny coins issued in the same period. Typically for British coinage of the time, the denomination (or, indeed, the country of issue) is not spelled out on the coin. The various denominations can only be distinguished by size.
The second reverse (1839 - 1868), also designed by William Wyon, shows at its centre, on two lines, the value and denomination in words: HALF FARTHING. Above that, St Edward's Crown. Named after Saint Edward the Confessor, it has been traditionally used to crown English and British monarchs at their coronations since the 13th century (with a two-century gap between 1689 and 1911).
Below the denomination, the date [year], under which a rose, a thistle and a shamrock combined - the floral symbols of the constituent parts of the United Kingdom, respectively England, Scotland and Ireland (except for 1839, when there was only a rose).