Thoughts on this coin....

@Ancient Aussie mentioned the same, so I took a closer look. I can see what both he and @Valentinian are referring to. Needs a better image of that section of the coin to be certain, but I would bet it's the result of the image.

 

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*edit* ...

 

Also the obverse the letters around the rim from 6.00 to 10.00 seem to be merging on the edge.

 

I tend to agree with Pishpash on this observation. Also, the fine lines in the cape on the reverse seem a little too sharp when compared with the wear on the high points of Mars' torso. But it's hard to be certain.

I have the Domitian "version" of this coin, thought to be minted in Thrace:



DOMITIAN 69 - 81 AD.
AE Sestertius (26.88 g.) Thrace 80-81 AD RIC 509 Titus
CAES DIVI AVG VESP F DOMITIANVS COS VII, laureate head right / S C across field, Mars walking right, holding spear in right hand, trophy over left shoulder

In the OP coin, the lines in the reverse cape are much finer, and the sand patina appears to be applied, although again, I'm no expert in this area.