This is an example of a rare, prototype German Artillery Luger combination holster/shoulder stock. These were developed in the 1908-1910 time frame and were intended to both used as a shoulder stock for early Artillery Lugers and to also act as a wooden holster for the Lugers. There were only a handful of these actually made (estimated at less than 50) with almost no examples being seen or even offered today on the collector market. These were a very short lived prototype variation, that was produced by DWM under direction of Georg Luger, that abandoned this concept in favor of using the flat board stock version with a standard leather holster. This later design proved to be far more durable and easier to produce. This super rare example is actually numbered "37" on the back side of the holster itself, next to a small script letter "W" proof. The inside of the lid also has the correctly matching serial number "37" with the upper top edge of the lid correctly checkered. It is currently fitted with a standard WWI Artillery Luger attaching iron that is numbered "3105" on top. This stock still retains the original, double metal loops on the left side intended for a leather shoulder strap (not included).