An interesting Arab-Byzantine fals - countermark? - need help with ID

I purchased this small late 7th century AD imitation of the standing follis of Constans II a couple of months ago, and just got around to photographing it today.

There's terribly unusual about the obverse, pretty much patterned after other standing emperor imitations that I have seen. However, on the reverse there appears to be a symbol or figure under the M which is either a countermark or part of the die. As far as I can determine this design looks like a seated figure with a chi rho above, but that is just a guess. There's also another larger chi rho above the M.

If anyone can shed more light on this as well as the mint, I appreciate the help.

Thanks!

Arab-Byzantine, AE fals Imitating Constans II, late 7th century AD.

3.84 grams

 

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Here's an update:

This is an issue of Dimashq (Damascus), c. 670s-690. The symbol under the M is a star that is partly obscured by a die chip. The blundered Arabic legend around reads jaza hadha Dimashq wafiyat ("lawful this [fals in] Damascus true [weight]"). SICA-1, 564 (Goodwin type VI); Album 3517.3 (R).