This is a very interesting pistol and thread. Your photos are very well done.
I compared the various frame markings on your pistol near the mainspring, and the markings near the trigger pivot to pages 577-581 of Gortz and Sturgess, which goes into some detail on DWM frame internal/inspection markings from inception of DWM production to 1930. I cannot match any of the markings on your frame to their photos/descriptions of DWM internal frame markings for any time period.
So, based on this admittedly limited research, combined with the fact that the frame does not have the Mauser hump that appears on 1937-on production, my guess is the frame is Mauser production 1931-1936.
As a relative newbie I don't offer this as a definitive dating of your frame, but am hoping more experienced collectors will comment on this approach to dating the frame.
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