Alexander III Tetradrachm - help ID exactly which one please?

The chap who has brought me a lot of ancient coins before has left me with another pile to ID with a view to selling to me. This one he maintains he spent a lot of money buying many years ago. I have got as far as Alexander III of Macedonia Tetradrachm, but cannot work out which of the many varieties. I suspect it is a Danubian Celt copy, but again not sure which. (Or is it a repro?) Any ideas? Weighs 16.3g and measures about 30mm across.

 

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Reverse looks more worn than obverse. Not that it means anything.

 

It looks old, but I don't know why I feel suspicious!

 

It looks legit to me.
It is a civic tetradrachm in the name of Alexander, struck in Asia Minor ca. early 2nd century BC.
Looking at the style of the face of Herakles, I think it is minted in Perge.
Something like: https://www.acsearch.info/search.html?id=1122976
I can't make out the monogram on the reverse so an exact reference wouldn't be possible

 

looks legit to me as well. can't help out on the details though, not my area of specialization...

 

Thanks @Pavlos - that gives me enough to go on.