Markings Help with 1914 Mauser

[gunningator]

My dad is clearing out some items and found and gave to me this Mauser 7.65.  Doing a little online research, it appears to be a 1914 Mauser number 214408.

I am trying to figure out the stamping on the grip below the trigger.  It was marked S.D. IV which is X'd out and now has K.D. 117.  There was a thread that linked to Old German Military/Police markings http://oldmilitarymarkings.com/police_unit_marks.html , I found S.D which I think is a Prussian Police, Duesseldorf District.  I can't figure out the K.D 117.

Any help with the markings?  Thanks!

[1914mauser]

Both are Wiemar era (between WWI & WWII) police markings. The best reference for these type of markings is "History Written in Steel" by Don Maus. He is a member on Jan Still's luger forum. If you post a thread there he would probably reply with the meaning of both markings or you could buy his book.
 
Regards,