Photo of the obverse would be helpful. It looks like a Caria, Kaunos. https://www.acsearch.info/search.ht...de=1&fr=1&it=1&es=1&ot=1¤cy=usd&order=0
I've been looking and the closest I can find is Ptolemaic Kings of Egypt, but nothing exact. What is the weight and size and what sources have you already reviewed?
Have you tried on NumisForums? If you're not a member there, I could post it there for you if you want.