Diocletian (284-305). BI Antoninianus, Siscia mint. Obv. IMP CC VAL DIOCLETIANVS P AVG. Radiate and cuirassed bust right. Rev. CONSERVATOR AVGG. Emperor standing right and Jupiter standing left, sacrificing at altar, each holding sceptre; in right field, Γ; in exergue, •XXI•BI•. RIC V 263. BI. g. 4.31 mm. 24.00 Scarce. Broad flan. Superb and fully silvered, with reddish highlights. EF.