Diocletian. AE Antoninianus. 290-292 AD. Ticinum. 

IMP C VAL DIOCLETIANVS AVG, radiate, cuirassed bust right

IOVI CONSERVAT, Jupiter standing left, head right, 
holding thunderbolt and sceptre, eagle at foot left, 
two standards in background. 

Mintmark SXXIT. 

RIC V-2 228. Common

With permission of Roma Numismatics, March, 2010