George,
I have a 1914 DWM with the same marking on the left grip. Both grips are numbered to the gun, as is the magazine, but the side plate was renumbered upside down (?). There is an armorers "X" under the sideplate just behind the trigger and the barrel is marked "BO30". I've always been curious about the grip marking and am surprised to hear that there is another one like it.
Lyn
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