If genuine, this wooden holster looks to be a very early prototype LP08 shoulder holster. Detailed drawings could be seen on pages 1332/1333 of Sturgess & Gortz book (green édition). A backside picture of it, is on the old manual of F.A.DATIG (The German Military Pistols 1904-1930). Note that the attaching iron latch to the gun is the push button type design which is used on some prototype board stocks and pictured on several very early DWM user manuals.
I found a photograph of the Russian hunting catalog for 1910/1911. Numbered 256 "News! A 9mm Parabellum automatic pistol with a wooden stock that instantly turns the pistol into a large automatic carbine" If you look closely at the picture, you can see that this is a Mauser type holster.
I think that the pistol in the picture is very approximate. Literally it says only that the caliber of the pistol is 9mm. It also says that this is a model "Lux", the price is 58 rubles, the same pistol of ordinary work, without a stock, is 13 rubles cheaper.
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