First some background. After WWI, the new "Weimar Republic" had a massive gun control problem. After the armistice, a lot of the Soldaten didn't wait to be mustered out, they simply went home, and a whole lot of them took their guns with them. So the country was awash with Lugers and various models of Mauser rifles. To try and get some control, a law was passed to pay a bounty for any military weapons turned in to the authorities. But then someone wondered how to keep the cops or the depot people from stealing the guns and turning them in again for another bounty. The answer was to mark guns that were turned in with the date of the law, as a kind of property mark, 1920, in addition to the original military markings.
But to make sure guns didn't just walk out of depots, the law also required that those guns already on hand that could be kept for the police and the small army allowed under the treaty of Versailles also be marked 1920.
So, we have those "double date" Lugers and Mausers, with 1920 under the original 1914 or 1917 or whatever.
Since police were allowed to have 9mm Lugers, many ex-military guns were reworked for police use. Reworking was not consistent. In some cases, the pistols were "scrubbed" of all old markings, in others police markings were applied and the old marks remained.
Still, the need for pistols apparently was not satisfied, and the government contracted with DWM to produce new Lugers, using wartime parts. Those were made and commercially proved as new guns, and were also given the property mark 1920. This time, though, there was only the single date.
IMHO, that is what you have, a Luger made for Weimar republic police by DWM in 1920. It has the correct Crown/N proof marks, and the sideplate safety required by the police to keep the gun from firing if the sideplate was removed. (Why this was a problem for police, I don't know; maybe the cops were just less safety conscious than the army!) Also it has the holster with, and numbered to, the gun, something that was done for new police guns, but not for reworks and not done for army issue.
There were only a few thousand of those guns, so they are a highly desirable Luger variation. Note, I said, IMHO, but that is based on the pictures, which are not very good. In this case, I strongly suggest you go to the Luger forum with better pictures and see what they say.
To complicate things, in that period, the Germans were desperate for hard currency and they reworked and sold thousands on thousands of reworked Lugers on the international market. Those are often called "1920 models" but they do not have the actual date on them, and most are in .30 Luger, not 9mm. Because there are so many, and they are reworked military pistols, their value is relatively low. But I think yours is in another category and more valuable.
Jim
