Just another input for what it's worth. 30+ years ago when I was a young soldier apprenticing to a master gunsmith (for FREE just to learn what he knew!) we used to place such index marks on new barrel installations (we never worked on a Luger barrel unfortunately) so that once a barrel was headspaced, if it ever became necessary to remove the barrel either for finishing or repairs, it would be a simple matter to restore the headspace without a guage by simply aligning the index (witness) marks...
we would make these marks in discreet locations and as small as possible so as not to detract from the owner's perception of the gun's value...
This methodology of course could have absolutely no relationship to why Lugers have these marks, but my inclination would be that it was for the same reasons.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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