Carausius AE Antoninianus, ca 287-288 AD. Rotomagus mint.

IMP CARAVSIVS AVG, radiate, draped bust right.
CONCOR MI, Clasped hands.
Mintmark RSR. 

RIC V-2, London 603, rated rare.

Courtesy of mikevosper Ancient Coins on vcoins, June 2011.