Carausius, AE Antoninianus. Camulodunum mint.

Obv: IMP C CARAVSIVS PF AVG, radiate, draped, cuirassed bust right
Rev: VIRTVS AVG, Mars standing left, holding reversed spear 
and shield.
S-C across fields.
C in exergue. 

RIC unlisted, CNG Auction 60, 2002, Lot 1881

Courtesy of CNG, cngcoins.com