William IV 'Royal Mint 1836' AR Groat, 1.86 gr, 16.34 mm. Dated 1836 AD. 

Obv: GULIELMUS IIII D: G: BRITANNIAR: REX F: D:, head right. 
Rev: FOUR PENCE, Britannia, helmeted, seated right, holding trident
and resting right hand on shield. Date 1836 below. 

S. 3837; 1918; BSC 380. Fine. 

Courtesy of TimeLine Originals (www.time-lines.co.uk), Nov. 2010