Magazine for 1916 DWM Luger

[MFC]

To further what Ed said...starting sometime in the Weimar era.
From what I've gathered from previous post on the subject, I beleive the different proofs identify specific proof houses and were used by whomever was assigned to pass final inspection.
Imperial proofs that were assigned to a specific person were a Crown over a gothic letter, which was the first letter of the inspectors last name.
Mike C.