I am sorry to say that your coin is a modern fake made in Bulgaria by the faker Slavey. See this one from an online forgery database:-
This is a coin from my small Greek collection: Ptolemaic Kingdom, Ptolemy VI Philometor, 180-145 B.C., Tetradrachm Obv:– Diademed head of Ptolemy I right wearing aegis Rev:- PTOLEMAIOY BASILEOS, eagle standing left, head left, on thunderbolt, wings closed Minted in Alexandria, B.C. 180-145 Reference:– Svoronos 1489, SNG Cop 262
