Bronze antoninianus, 23mm, 3.28gm, issued AD 276-282 Siscia mint.
Obv: IMP C M AVR PROBVS PF AVG, Radiate, cuirassed, bust left, with spear and shield.
Rev: VIRTVS PROBI AVG (XXIS in ex.), Mars, helmeted, walking right, holding spear and trophy.
References: Sear 12071, RIC 810.