Diocletian, Siscia, AE Antoninianus. 289-290 AD. IMP C C VAL DIOCLETIANVS P F AVG, radiate and cuirassed bust right. CONSERVATOR AVGG, Diocletian and Jupiter, each holding a sceptre, standing facing each other by an altar. Gamma in right field. Mintmark XXI dot BI dot. RIC 263: Sear 12640. With permission of Gorny & Mosch, March 2005.