Just my $0.02...

Nice example of a 1940 Luger. IMHO I do not believe that these grips are original to this gun from the factory. They are either modern reproduction grips (most likely), or the black style grips issued with Lugers produced by Krieghoff (possible).

The back side of original (left side) bakelite grips would have what I call positioning "islands" that are elongated with rounded ends. These grips have positioning islands that look nothing like that.

The back side of genuine bakelite original Mauser grips should look like this:

http://forum.lugerforum.com/attachme...1&d=1355176798

But I caution everyone, there are some reproduction grips out there that used this type of genuine grip as a model for their mold. Caveat Emptor...

Yet the details and surface smoothness look right. Curious.