If it is real I think it would be a coin from Syracuse. Charioteer driving quadriga, maybe a dekadrachm, Head of Arethusa? It would be from roughly 400 BC. If it were real and what I think it is supposed to be, it would be worth quite a large sum of money.
can you scan the coin? if not, can you get better pics...that way we can tell youif it's real? The coin is from BC Greece and is a jackpot hit if it is legit. stainless
It has Nike flying above crowning the charioteer below is a military shield, greaves, cuirass and helmet / Persephone or Arethusa, wearing earring and necklace; dolphins. There are a wide variety of these often signed by different makers...and there are a wide variety of fakes. Below are a few real nice examples: