This is tough one to definitely say yes or no.
My concerns if buying a raw Drachm in your case would be too regular shape of coin for an antique, I dont know if someone was making edge more appealing, as well, tiny details on coins are off, for example lips on heads and bird head which are not equal to ones sold online. It could be due to wear on some coins and fact that antique coins can vary in looks of details more than modern coins with good quality control. As well your coins is quite off center.
Take a look on details sample Drachm from Numista catalog
N#180356
Your coin is definitely hammered, not molded, and i would not argue that.
If you got this coin from reputable shop for a normal price, i would be relatively calm about coin being good.