Quick answer: A drachm from Kolophon (Colophon), posthumously in the name of Alexander III (aka: Alexander the Great). Probably Price 1770. Like... https://www.acsearch.info/search.html?id=13061679
Yikes, no, sorry. "Price" is a catalog of Greek coins. That catalog's assigned number for the type you have is #1770. For comparison, here is a somewhat higher quality example of the same type you have that sold at auction for $72. https://www.acsearch.info/search.html?id=12005464
You accept the coin as genuine, not a casting? The surface of the reverse seems tell-tale though the obverse does not have the same problem. I have a hard time with pictures. So, I'm asking. Thanks, Mike M.
I made no comment re: its authenticity, one way or the other. My reply was directly geared to the OP query for an ID of the type. Based on the OP images alone I could/would make no definite acceptance or assessment of its genuineness. p.s.: But I would say the silver coon posted by @Alegandron is legit. ;-)