[Pistol]

Nice find. I believe your 1921 DWM is a direct military issue to the 18th Infantry Regiment of the German Reichswehr. It was weapon number 41 to maybe the first battalion because the number before the slash is a roman numeral I. Normally the number before the slash is the company number.

According to German military wiki reference:

"The 18th IR regiment was formed on January 1, 1921 from the Reichswehr Infantry Regiments 13 and 14 and the Reichswehr Jäger Regiments 31 and 32 of the transitional army . Since it was a mixed country team, only the respective battalions were given the country team designation "Prussian" or "Lippisches" in addition to their names on May 29, 1922. In the course of the expansion of the Reichswehr, the regiment was divided into the first wave in 1934 and the Paderborn Infantry Regiment (IR 18) and the Münster Infantry Regiment (IR 39) were formed."

Garrisons - Paderborn : "Regimental staff, 1st (Prussian) battalion with staff and 13th ( MW ) company"

Any stamps, dates, or mark's on the holster?

 

[Pistol]

congratulations, you have a rare holster. can we see some photos of the markings and date?

What else may be hidden in that building?

 

[Pistol]

Here are some pictures of the holster, it’s not in the best condition anymore.
the building is from 1883 and we’ve found different kinds of documents, newspapers, checks etc from the years1889,1908,1917,1921 so far. I will show you also a picture of the building.

The building is called Momus, in Maastricht NL. On Wikipedia you can find its history.
We know story’s of a previous German guy who owned this place, the story’s also said he had a large picture of Hitler at his office. We believe this gun is his and he hid it at the attic.
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Interesting ......do you have a photo of the front of the luger tool?

 

[Pistol]

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Thanks - what about a photo of the other side?