P-08 Artillery holster price check

Hello,


I have an opportunity to buy a P-08 Artillery holster that is in VG overall condition. Unfortunately, the lanyard (flap)is missing. Markings are: 1917, Berlin and the manufacturer's name (hardly decipherable). It was not part of a rig: the holster has belt loops. It comes with original loading tool and cleaning rod with wooden handle. I am puzzled by the fact this holster is black: weren't German Imperial holsters brown? The owner wants me to make an offer. How much should I offer? Thanks in advance.