Jerry,
Several pertinent observations were made in the course of the witness mark study of a few years ago.
Witness marks are a post-assembly application.
Original replacemant barrels were reported without witness marks.
At that time I owned 29DWM sn 7428u, a Police Luger marked H.P.495., whose barrel proof and serial number appeared authentic, but without the barrel-side of the witness mark.
Most Krieghoffs are found without witness marks at all (barrel or receiver), indicating that these marks are indeed not required for assembly and Krieghoff simply did not bother with them.
--Dwight
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