That would be the mint mark. I looked through the list of mint marks and there is one for A-o but there is that cross that looks like a plus sign above the o.
I agree with @eddiediz on this, but note that Huszar also lists a A-γ version where the lower half of the gamma is a loop. I'm not 100% sure which one you've got there.
Either way, I'd attribute this as Huszar 568 and Frynas H.27.14
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