Probus. AE Antoninianus. Siscia mint. 277 AD. 

IMP C M AVR PROBVS P F AVG, radiate bust left, wearing 
imperial mantle, holding eagle-tipped sceptre

ADVENTVS PROBI AVG, Probus on horseback left, holding
 sceptre, raising right hand; captive on ground before
 horse. 

Mintmark XXI and officina letter in exergue. 

RIC V-2 Siscia 632; RSC 57.

With permission of Roma Numismatics, Apr, 2010