The original numbers and acceptance stamps are often lost when a Luger is heavily buffed, which often happened before they were refinished. It's hard to tell from your photos, but I think that might explain why the remaining numbers are so hard to make out.
Lugers parts are notorious for their distinctive marks. It is possible that some of the parts are unmarked after market replacements, too.
I have seen a few guns that soldiers assembled from parts they collected. Usually, those guns don't work well, because despite having identical parts, they almost always need the fine fitting that only an experienced gunsmith can do.
The "2" and "0" in the front of the frame in your last picture look like they were added and it is not how the factory would have marked the gun.
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