Diocletian Coded - B with O - Siscia - RIC 263var

IMP C C VAL DIOCLETIANVS P F AVG (1); CONSERVATOR AVGG; Radiate and cuirassed bust right (F); Jupiter on the right standing left and Diocletian on the left standng right facing each other, each sacrificing from patera, over a tripod type alter; with B in right field and XXI O in ex.