Fake or genuine?

Like I said, I would defer to more of an advanced collector of Ardashir coins. I just didn't see a match in SNS, Tom Mallon's site, Sellwood, or other places I look. If you know more about them than my references I am not going to argue.

 

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Is there an easy tip that allows these four to be distinguished? Later Sasanians used so many mints that it is easy to write off discrepant coins as just one you have not noted before.
I only have two of this king and one of them is the billon tetradrachm struck for foreign tastes.
4.3g
12.3g