I believe this coin to be an ALEXANDER III (or not . . .)

I believe this coin to be an Alexander III but I am unable to identify the 'reverse'.
It weighs 5.45gm., and measures AE19mm.
The 'obverse' photo is pretty well self explanatory, and I have taken 4 photos of the 'reverse' on different axes.
I am hoping that someone may be able to see something in the photos of the reverse that will point me in the right direction. Thank you.

 

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Not sure about the reverse but the obverse looks like Ptolemy wearing an elephant skin headdress.

 

It is a coin of Ptolemy I Soter.
Obv.: head of Alexander wearing elephant-skin
Rev. : ΠTOΛEMAIOY BAΣIΛEΩΣ , eagle standing left on thunderbolt, wings open.


Here is mine (AE 22 mm):

 

Thank you fellas. I became tunnel-visioned.
You've helped me a lot.

 

...well, it was Hercules..