Help with a large Greek Piece.

From my limited knowledge I believe this piece to be Greek. It is by far one of the largest ancients I have seen measuring a pinch more then 40mm. What do I have here?

Thanks in advance my all knowing ancient collecting friends.

 

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I'm sure a specialist would know more, but if memory serves, this is from one of the Ptolemies, likely 2nd or 3rd century BC.

 

Greek by way of Egypt It is a Ptolemy bronze with the head of zeus.

 

yeah its Ptolemy, cant say which though maybe IV? (nm, I dont think im right with IV)

 

Definitely Ptolemaic, but I don't know enough about Ptolemaic coinage to give you any more than that, though this site may prove useful to you here.