Hi! i went to our museum to get this identified. One of the jurors there suggested this to be from the Kushan period, 10 - 20BC, Gandhara, Pakistan. He said that carbon dating could get me favourable results. Its a broze he said, but he was interested in the design more because he had never seen one done in this manner before, saying that this could be a rare. He advised that i send it for valuation.
My father was an archaeologist. He was engaged in a dig during mid 70's in Pakistan and that is where he acquired this coin from, passing it to my mother who gifted this to me.