I found a coin and I'm trying to identify it?
I found what appears to be an old Greek/Roman coin in my yard and I'm trying to identify it. It had what appears to be a greek roman man facing the right on the front, it is large like a silver dollar, it appears to be silver and very light in weight. It has wording on the front all the way around it that I'm unable to identify, but in the left center in very small print it says "specimen" and on the back it says "SP.Q POPIMOP.RINCIPI" around the top and "S C" on the bottom. The picture on the back is what appears to be a shield, suit, and hat perhaps on th left, but I'm not sure? On the right (back) it has a man wearing a hat facing the left with his right knee up and his elbow resting on it with hand on his chin. He is sitting on something that looks a like a shield and feathers, but I don't know what it is? Can you indentify this coin, and tell me if it's even real? I've searched on line and the closest coin I have found is (Nero, 54-68 AD. AE As, Rome 65 AD) in resemblance, but it is not that coin. I also searched wording on coins and found what is very close to the coins words on back but it was "SPQR OPTIMO RICIPI" Which was something to do with an emporer, as you can see the spelling is different slightly on my coin. Help Please...