This Walther PP pistol is coming up for auction near me, and I wanted to get some opinions on it before the big day. It appears to be a normal wartime Walther PP pistol, but the grips are a white color instead of orange. Has anyone seen these types of grips before? Are they wartime manufacturer? Does this increase the value of the pistol? They are marked with the Walther banner. Sorry, this is the only picture I am able to get at the moment.