Hi Tim, I have of course read Dwight Gruber's article on witness marks and I repeat what I said earlier, they were marks that were applied separately to barrel and receiver as an aid to assembly. If they line up perfectly so they appear to have been struck with one blow from a single instrument (as Dwight defines it), it's by chance. I specialize in Imperial Navy Lugers, and have examined several dozen first hand, the only perfect "witness mark" I've seen was on a known fake! See photo below.
You asked for our thoughts, I gave you mine. You are, of course, free to believe what you like.
Norm
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