Owl Tetradrachm -- authentic?
I know that these are heavily counterfeited as a type. In fact, I bought this in a group that contained a bunch of counterfeits. The other counterfeits were non-deceptive tourist pieces. This one... well, I have no problem believing that it's also a counterfeit also, but I can't figure out what gives it away. Does anyone recognize this as a specific known counterfeit?
Weight is 17.0 grams, which is what it should be. There's a 90 degree rotation between obverse and reverse, which seems an odd detail.
The most suspicious part is that it has actual luster...?