Diocletian (284-305 AD). AE Antoninianus, Siscia mint. Obv. IMP C C VAL DIOCLETIANVS PF AVG. Radiate and cuirassed bust right. Rev. CONSERVATOR AVGG. Emperor and Jupiter sacrificing at altar, each holding sceptre; to right, B; in exergue, XXI•O•. RIC V, 263. AE. g. 3.91 mm. 23.00 Superb and fully silvered. EF.