Mark,
The sources I have claim that the December 1918 production stopped somewhere in the 'L' region,
If they were still planning to chuck out guns in December, the M-range seems to fit nicely.
I believe this gun was made in late december 1918 and was diverted to a non-military source as a result of the end of WW1 and DWM's efforts to keep their production lines. It's unlikely that it made it to market before june 1919.
Since it has no 1920 property mark my best guess is that it was sold to a private person.
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