Wonder I beg to differ, but the holster is a police issued holster. Not from 1945 when the pistol was manufactured, but still police. Even though the pistol is a 80% in condition, a end of the war police pistol, with correct holster, and maybe serial numbered mag? would attract serious Walther collectors to pay 1500-2000 for this rig.
Near the end of the war they were making alot of pig skin & even paper holsters. You have a nice collector grade pistol there. If you scan Ebay you may find some original black grips for it. Hope this info helps?
By the way, could you send a closer pic of the mag?