I've found this silver coin, I'm almost certain that it's from emperor Septimius, however, I couldn't find match even after checking multiple catalogues. It was found in Srem, northern Serbia.


Legends ( I'm gonna use "_" for a single unknown character, and "*" if there might be more but I can't tell how much):
obverse: *CNE*C*
reverse: ___KECPER__ _ERTA______
I'm not really sure if I recognized characters correctly, it's really hard to see.