Carausius, AR denarius, London. AD 286-293. 20 mm, 2.99 g. 

IMP CARAVSIVS PF AVG, laureate, draped and cuirassed bust right.
CONCORD MLI, clasped hands.
Mintmark RSR. 

RIC V-2, London 548 var (rev legend). Rome Numism. 2, 746.

With permission of Roma Numismatics auction 2, Oct. 2011.