Carausius, AE antoninianus. Camulodunum mint. 

IMP C CARAVSIVS PF AVG, radiate, draped bust right.
SALVS AVGGG, Salus seated left by altar, holding patera
and sceptre, feeding serpent rising from the altar.

Mintmark SPC. 

RIC V-2 Camulodunum 404 var (obv legend); CNG 215, 482; Bourne 159.

With permission of cngcoins.com.