Probus AE Antoninianus. Siscia. 

IMP C M AVR PROBVS P F AVG. Radiate, helmeted, cuirassed
bust left, holding spear and shield.
VIRTVS PROBI AVG, Emperor galloping right, spearing enemy.

Mintmark XXIA.

RIC V-2, 817.

ebay sale, Herakles Sept 2001