Maximian (286-310). AE Antoninianus, Siscia mint. Obv. IMP C MA VAL MAXIMIANVS PF AVG. Radiate and cuirassed bust right. Rev. CONSERVATOR AVGG. Emperor and Hercules, face to face, sacrificing at altar; to right, B; in exergue, XXI.KOY. RIC 580. AE. g. 4.26 mm. 22.00 Fully silvered. EF.