Most of the conclusions are from books, or personal knowledge. You could try finding a copy of "The Standard Directory of Proof Marks" by Wirnsberger to start with. Then the 3 volume set by Jan Still, "Imperial Lugers", "Weimar Lugers", and "Third Reich Lugers" would be useful as well. Plus a good old copy of "Lugers at Random", although somewhat dated, can still be a useful basic reference.
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