Who is this emperor, please help id

I have no clue whose radiate head is depicted on the obverse. On the reverse it's probably Zeus

Any info is very much appreciated.

AE 26

CNG picture from a multiple lot picture:




My pictures:

 

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It seems to be quite similar to these two . . .

https://www.acsearch.info/search.html?id=13084135

https://www.acsearch.info/search.html?id=13462934

(But in your obverse image there is clearly an "O" behind the portarit.)

 

Thank you so much @philologus_1 will use your info to try to find it. Could the O be part of AVTO(krator)?

 

Just an update, it is Philip the Arab