Diocletian AE Antoninianus. Ticinum, AD 284-305. 23 mm, 4.19 g.

IMP C VAL DIOCLETIANVS AVG, radiate, cuirassed bust right.
IOVI CONSERVAT, Jupiter standing half left, head right, 
holding thunderbolt and sceptre. 

B in left field, mintmark XXIT

RIC V-II, Ticinum, 232; Cohen 192.

Image courtesy of the Münzkabinett der Universität Göttingen