Time period would be around 270-300AD Roman. However, from the reverse, I suspect it might be a contemporary imitation. On the left side the legend reads II II II. It would help everyone if you placed the coin down and got a pic of the obverse so we could see the whole legend.
It might be easier if your finger was not obscuring part of the obverse legend The portrait looks like Claudius II.
My guess is Claudius II, Annona reverse. (from Wildwinds) Claudius II 'Annona' Antoninianus. Rome. 268-270 AD. Obverse: IMP C CLAVDIVS AVG, radiate head right. Reverse: ANNONA AVG, Annona standing left, foot on prow, holding corn ears and cornucopiae. RIC V-1 18; Sear (1988) 3197.
M's and N's routinely become III and II at this time. We should bring that font back. IIIOIVLI) YOII LIKE IIIAI?