Diocletian (AD 284-305).
Antoninianus
(AE, 23 mm, 3.41 g)
AD 291, Lugdunum.

IMP DIOCLETIANVS AVG Bust of Diocletian right, radiate and cuirassed. / SALVS AVGG Salus standing right, feeding snake held in arms; in exergue C.
RIC 88.
Nice dark patina. Traces of silvering. Good very fine.