It does not appear to be an ancient Greek coin. I suppose it could be a heavily worn, clipped and mutilated late Roman bronze, but it's probably just a piece of metal. Not sure what its original use was. Certainly looks ancient, though.
I dont think it has been altered. It is symetric in all its sides and angles. I thought it might have been from pre celtic period in these parts... Thanks!
Pretty sure its a Roman Republic 4th Century Aes Formatum , these come in all sizes weights and forms.