Please Help Identify Unit Marking on 1916 DWM

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Thanks for the feedback guys. I have done some further checking and it appears that other than the magazine and grip panels, the pistol has matching numbers. There is an ''S'' stamped into the back side of the left grip but nothing else. Any further info on the background of the grip strap markings would be greatly appreciated as it becomes available.
Thanks again guys.




I'm a little confused about the sear safety. I was shown samples of Lugers with what was called the sear safety modification that were done for police use.. My pistol doesn't have the additional little bar attached. I've attached a picture with the area highlighted that I am talking about. I may have misunderstood the discussion but again, my pistol doesn't have the addition that the other pistols had. I assumed that this pistol was an army rework.