So, I may repeat myself, but some further info;
The Crown N on the top is a commercial marking, yours is a BKIW-Mauser Transitional DWM Luger from the late-1920's, would have to check my Weimar Lugers book to get a better approx date, plus see a clear picture of the suffix on the front fo the frame. The WaA66 is also from that time period, pistol was commerical, then taken / bought for police, but the military accepted it on the right.
At some point it received a Sear Safety and a magazine safety (post 1933), so was used by weimar police, then nazi police.
No offense to your grandfather, may or may not have been an officer. All the nazi uniforms looked like officer uniforms to many GI's.
I have a modified holster for a police pistol I have too, it is cool. Many holsters were modified by GI's after capture.
BTW, see note above, your pistol
was made in the 1920's...
I would love to see pictures of the assorted items that came with this. And are you interested in having this placed in my book?
Ed