I am trying to determine value of a 1910 DWM Luger, 9MM in what I would consider very good to excellant condition. Serial #4603c with numbers matching on body and barrel. I am also trying to figure out the "Regiment Markings" - 119.R.5.1. Having no luck tracking down the book "The Imperial German Regimental Markings" by Jeff Noll. The gun belonged to my deceased father in law so I have no background information as to where he obtained the gun. Any info would be appreciated.