Hello,
I have this Roman silver coin, I believe a tetradrachm with Philip II. It is about 28 mm tall and 25 mm across and slightly under 2 mm thick and around 11 grams . From what I have seen it is similar to Philip II tetradrachm Antioch syria coin from 247-249 ish AD.
Everything appears the same as some of the similar coins, except his face is turned to the left instead of the right. Or similar coins will have a different bust or the eagle facing a different way. I can't find one exactly like this so I was questioning if it is authentic (bought it years ago for like $100 and am now thinking I got duped).
I'm pretty new at all this and don't have much experience. Thanks!