Based on my limited experience, the favorite WWII souvenir for such grips was the Radom. I have seen at least 10 Radoms with plexiglas grips, a couple with women's pictures underneath, some with just white paper to look like ivory. One even had pink paper! (No, don't ask!)
The reason is probably that the Radom has a flat frame and making grips was easy, where it would be very difficult with a Luger and impossible with a P.38.
Jim
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