Hi Glenn,
On these Imperial era DWM Lugers, you'll find factory inspector stamps in many places like the ones you found.
These stamps were used by individual factory inspectors as they measured, gauged and judged the quality of hand finish work in the many steps of manufacturing Lugers. The government inspector stamps were only used after manufacturing completed and final acceptance testing and proof testing was done.
The stamps take the form of letters and sometimes cryptic symbols. In each case, they correspond to an individual inspector.
This changed from manufacturer to manufacturer and in the different periods. Toward the end, in the 1940s, Mauser eventually designated a single inspection stamp "WR" in a circular motif.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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