What's going on with this Amisos Gorgon? Overstrike?

Yes, there is die shift/doubling. But is this an overstrike? What might be the undertype?

 

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Beauty right there. And a type I LOVE.
THANKS fir sharin er.
At first I was looking at what looked like a slightly cracked flan or Something of that nature on the obverese.
But I see that unique design and lettering on the reverse...
Excited to read expert opinion.
However, since you teased about it doubling. Here's a double strike so nice the Gorgoneion was obliterated:

 

Not an expert, but to me it simply looks like some fancy monograms on the reverse, a small crack, and the file marks from flan preparation often found on these.

Here is mine:

Pontos, Amisos (Kingdom of Pontos under Mithridates VI Eupator), AE 21, ca. 105–85 BC. Obv: Gorgoneion in aegis. Rev: [A]MI-ΣΟ[Υ]; Nike advancing r. with palm branch; in fields, monograms. 21mm, 7.40g. Ref: SNG BM Black Sea 1177–1191. Ex Ken Dorney.