Grip markings on my 1917 DWM Weimar Police

[AndrewC]

Hi everyone, I was cleaning the grips on my 1917 DWM Police, when I noticed the left grip was not relieved on the back side for the mag safety spring. ( it was clipped off at some point ) This grip has what looks to be a "gothic" S stamped in it, also something that looks like a bell with something above it? will include pictures. the other grip which I believe is original has an eagle with drooped wings. Any ideas on the identification of the stamps ? there are no engravings on the gun, is this common for a Police Luger ? I am trying to retrace its history as best as I can. My Grandfather gave this pistol to my Father who later donated it to be put on display. It was on display, then stored for several years, then returned to me several years after his death. Sadlly I don't know the history other than my Grandfather brought it back from Germany. It seems like there is a large gap in its history ( Weimar to WW2 ) were Police Lugers used in military service ?? any help on the stamps and thoughts on this would be greatly appreciated. Cheers, Andrew