Diocletianus (AD 284–305).
Follis (AE, 27 mm, 9.66 g), Lugdunum mint, AD 303–305.
IMP DIOCLETIANVS AVG Bust of Diocletianus, laureate, cuirassed, right, seen from front / GENIO POPVLI ROMANI Genius standing left, modius on head, naked but for chlamys over left shoulder, right holding patera over altar, left cornucopiae; ✱ in right field, PLC in exergue.
RIC VI 175a.
Dark toning, some silvering. Minor red deposits. Extremely fine.