Probus, Rome, AE Antoninianus. 

IMP PROBVS AVG, radiate, helmeted, cuirassed bust holding 
spear and shield.
VICTORIA AVG, Victory advancing left holding wreath and trophy.

Mintmark R-thunderbolt-digamma (or R-thunderbolt-S)

Ref: RIC 214

Contributed by Peter Dearing, November 2009