It seems kind of odd but at that time in history even German efficiency failed and grips were not always marked as we would expect. Some were and some weren't. No good explanation, that's just how it was.
I can't tell that there was any pattern to the layout of the numbers, when there were any. Again sort of a random thing.
It may be just one of those things that has no rational explanation. Enjoy your Luger.
dju
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