Maximianus Silvered AE Antoninianus. Ticinum mint, 287 AD. 

IMP C M A VAL MAXIMIANVS PF AVG, radiate, draped and cuirassed bust right 
IOVI CONSERVAT, Jupiter standing left, holding thunderbolt and sceptre. 

Mintmark PXXIT.
RIC V-2 559
Contributed by Kim Nielsen, Jan. 2014