Probus AE Antoninianus. AD 276-282. Rome. 

IMP PROBVS AVG, radiate, helmeted, cuirassed bust left, 
holding spear and shield.
ADVENTVS AVG, Probus on horseback left, holding sceptre, 
right hand raised, captive before. 

Mintmark R dot in crescent digamma. 

RIC V-2, 157; Cohen 37.

Contributed by Martin Griffiths, 2005.