This mark is a standard, and well known, DWM internal inspector's mark. It is found in commercial Parabellums from the beginning of production into the 22000 serial range, as well as in Swiss military production (Sturgess). It is also found in army P08s and navy P04s through 1909 (ibid). Sturgess asserts that this is a DWM trade mark (red edition, p.226).
The mark itself is completely different from the U.S. Ordinance flaming bomb.
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