Help on identifying a DWM frame

[Ari1915]

Hello All!
I was trying to identify a DWM frame accordingly "The Borchardt & Luger Automatic Pistols" book and got stuck....

-The frame has the serial-# a8223
-The frame well shows a "N", could also be a "N" in a circle... and the letter "h"
-Near the trigger pivot is a "A"
-The rear frame shows "1" (could be an unclear "A"), "D" and "S"
-Also I recognized on the left side heavy processing marks which are not visible on the right side.

Any ideas, what frame I have in hands? Any help is much appreciated!

Thanks!