Lee,
I've only seen this kind of marking on military issued guns. As the family also owns an Artillery Luger I would consider as a hypothesis that the grips of both pistos had been switched in the past. Remove carefully the grips and check if there is any numbers or marks on the inner side. To add support to this idea, there are records of Artillery Lugers with such mark.
On the other hand, I learned to never say never in the collecting field: as the EWB was a militia organization it would be possible to have an originally private purchase pistol carried by one of its members and marked accordindly.
At last, but not the least, I think the gun is in original and pristine condition.
Welcome to the forum!
Douglas
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