Probus (276-282).     BI Antoninianus, Serdica mint, 277 AD.   Obv.    IMP C M AVR PROBVS P F AVG. Radiate, helmeted and cuirassed bust left, holding spear over shoulder and shield decorated horseman motif.        Rev.   VIRTVS PROBI AVG / KAA. Probus riding horse left, holding scepter and raising hand; to left, bound captive seated left.     RIC V 886.     4.27 g.   22.90 mm.          EF.