Unknown Roman or Greek coin (?) [решено]

I've had this coin for about 3 years now and still have not managed to find out its identity.
The coin weighs approx. 10 tot 15 grams and is yellow/gold in colour.
It is the size of a British shilling.
The obverse depicts an emporer or ruler and the head is embossed/raised from the coin surface.
I can make out a letter which looks like C.
The reverse seems to be a soldier with a spear or shield pointing to the right.
The text is not familiar, it looks like O DO.N and then T I ? ?.
Early coins is not my area of collecting and although i know my way around the coin world fairly well i am still stumped by this one.
Any ideas?

Photo's are not that sharp, photography was never a hobby of mine :)

Hey! That is a greek coin from Lokris Opuntii. I can´t say with certainty which coin is yours, but in the following webpage you can find similar issues.

http://www.wildwinds.com/coins/greece/lokris/lokris_opuntii/t.html

Hello Stavros.
Thank you, this is a great help!
I now have enough researching to keep me busy, if i find the exact coin i will upload it to the coin directory.
With better photos :)
Thanks again!!

As addition to this coin, i have also spoken to a Greek coin expert.
This would appear to be a fake, or a reproduction.
The metal is probably bronze or alloy and according to the source, no bronze coins of 25 mm in diameter were ever minted. All the Staters were silver.
That's his version anyway.
I don't mind, it's still a nice piece :)