Roman Empire. Carausius, 286 AD. AE Antoninianus. ‘C’, Probably Camulodunum  (Colchester) Mint. Pax Reverse. 3.74g.
 
Obv: Radiate, draped, cuirassed bust right. Rev: Pax standing left, holding branch and scepter, SP each side, C below.
 
A brown tone, an attractive and clear example.