PROBUS.
Ae, Antoninianus.
AD 276-282.
Siscia.
Obv/ IMP C M AVR PROBVS P AVG, helmeted, radiate and cuirassed bust left, holding spear over shoulder and round shield.
Rev/ VIRTVS PROBI AVG, Mars advancing right with spear and trophy, XXIQ in exergue.
Cat: RIC 810 Helmeted var.; S. Hiland & C. Oliva They don't catalog it.
Bronze (Ae) 4,3g - 23mm.
Rare.