Probus. AE Antoninianus. 3.00g; 23mm. Siscia. 279-280 AD. 

IMP CM AVR PROBVS P AVG, radiate, cuirassed bust left 
holding spear over right shoulder and shield on left arm

SOLI INVICTO, Sol, holding whip and raising right hand, 
driving spread quadriga facing. 

Mintmark XXIV. 

RIC V-2 780. 

With permission of Roma Numismatics, November, 2009