BTW, all the prewar "Original Wilhelm Brenneke, Leipzig" bolt action rifles were in fact made for Brenneke by E.Schmidt & Habermann, Suhl. If you have a close look you will always find the small trademark Esha stamp on these "Brenneke" rifles. Most often it is under the barrel, sometimes even hidden below the magazine floorplate opening lever.
The Brenneke rifles even retain the Schmidt & Habermann serial numbers, often found on the rear sight base. Here is again the rear sight and serial number of the full-stocked "Brenneke" rifle shown above:

And here is the one on my Schmidt & Habermann M21 in 6.5x54 K Mauser:

As Schmidt & Habermann numbered all their guns in one consecutive series, regardless of type and model, both rifles are datable to 1922-3.