Carausius 287-93AD, Antoninianus
Obv IMP CARAVSIVS PF AVG, radiate, draped, cuirassed bust right.
Rev SALVS AVG, Salus standing left feeding serpent rising from altar.
RIC V-2, uncertain British mint 1093, rated R3

Courtesy of Mauseus of the Forvm Ancient Coins, June 2011.