Super cool coin...but where is it from? ID help please

I received this AWESOME coin in a lot of Greeks the other day.
It checks a ton of my boxes:
It's Greek AE, thick, 2 counter marks, has an animal(horse, I think)....
BUT WHAT IS IT???
I checked ac search, wild winds and googled it. Nothing.
I'm pretty sure the front is Athena. Though I checked mars with horse and nothing.
The counter mark on the front seems to be same as the obverse. Or maybe Apollo. I haven't figured out what the obverse CM is.
It is between 23-24 MM.
Here she/he is. Any ideas who, where, when or why this coin is (also, any help in the counter marks is equally appreciated)

 

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A rose with a countermark on the reverse? Maybe Rhodes?

 

Perhaps Alexandreia, Troas with Apollo/horse grazing, such as at https://www.acsearch.info/search.html?id=4108854

 

Yes, I see that. Quite possible.

 

I suspect @Bob L. has the correct ID. I have a similar coin.

• 
  TROAS, Alexandria Troas, AE16 3.96g 261-246 BC
  Bear head right / ?LE?A? horse countermarked or overstruck with 7mm helmet within circle of dots/gorgoneion
  Host coin looks like CNG e-95, lot 40, of Alexandria Troas.
  SNG AUL 1460, Lindgren and Kovacs 322v, 261-246 BC
  Large double-sided countermark reminds me of CNG 61, lot 264

 

Thanks team! Funny enough, in a different lot from the same auction a won a Roman TROA from Alexandria that I'm pretty sure is Gallienus or Valerian (it even has a horse on the reverse as well).
@Ed Snible I'm wonderin if the cm on our obverses are the same (I just don't see my reverse as a Gorgon cm). Yours appears to be a helmet. I suspect mine to be the same. That or Apollo on Apollo (the ancient Greeks must've loved the symbolism there).
Any insight on the counter marks?

 

There is a book of COUNTERMARKS ON ANCIENT COINS but I do not have a copy.

 

I have Howgego’s book on Greek Imperial Countermarks but I acquired my coin before the book and forgot to look this one up. I don’t believe this paired mark will be found there. Gorgoneion countermarks alone are commonly found at Amisos and occasional at Ilion. I recall Howgego found them at Side and at Rhosus but I have never seen those.

My countermark is double-sided, paired with helmet. Your helmet looks like mine, even down to the beaded border. I can’t tell if your helmet is empty from your photo. What do you think your other side depicts? I rotated it but could not figure it out.

 

Thanks for the info and confirmation!
Now that I look closer, I think the reverse cm may be a beaten up Gorgon. I see the left part of the hair and both eyes.
Pretty cool us both having the same 23 hundred year old coin with possibly identical obverse and reverse cms!
It makes me think the cms were put on these coins at the same time...but by whom??

 

I did not record the orientation of the dies. Getting the small dies to match up would be difficult. It is likely the dies were hinged or there was some other contraption to line them up. If both of us have the same orientation, then there is an 11/12 chance that fixed dies were used.

Sometimes that information helps determine the mint. This is a special case and probably won't but I am still interested.

How can we figure out the whom? The fabric of the coin and countermark remind me of CNG 61, lot 264 which is a coin of Abydos struck with tiny Abydos dies. Because the gorgoneion is also an Abydos type it is a candidate.

The undertype seems to be Alexandria Troas. Ilion in Troas is known for gorgoneion countermarks. The fabric is similar to Abydos in Troas. Abydos used the gorgoneion on its silver coinage. My guess is "Troas Uncertain (Abydos?)"

 

A neat coin