Roman copper Antoninianus coin of Gallienus, minted between in 260-268 AD.
MINT: Antioch
OBVERSE; GALLIENVS AVG
-Radiate and cuirassed bust right
REVERSE; P M TR P XV P P
- Neptune standing left, foot on prow, holding trident, VIIC · in exergue.
REFERENCE: Göbl 1638b