Zamo
Generally speaking DWM did a better job at stamping SN's than what your seeing.
I don't know about the proof at the rear someone else will need to help you on that.
The gun looks like it has had bluing applied over rust, and the area just above the rear proof looks blued over too.
Pictures can fool us at times but I would be suspect of at least a re blue at some point and not a very good one, maybe cold blue.
That greenish tent you see supports this theory.
Hope this helps
Vern
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