Richard III AR Groat. 1483-1485 AD. 2.67 g. London mint. Struck June-July 1483.

RICARD DI GRA REX ANGL Z FRANC, mintmark boar's head above, crowned bust facing in tressure. 
POSI DEVM xx ADIVTORE MEVM, LONDON CIVITAS in two lines 
around long cross with three dots in each of the four quarters. Mintmark: halved sun and rose

Seaby 2154; BMC 369; Friedberg 531. 
Rare. 

With permission of Pegasi Numismatics auction 40, lot 736.