Long Holster
 

I have this holster and it seems to be for an artilleri luger But I never seen such before so therefor the question.
What is it?

It's a very fine example of an Artillery Luger holster.

Hi Hakan,
I would go out on a limb here and tell you that it's a rare and desirable Mars, Berlin Artillery holster except for some anomalies. First the good news, the body of the holster looks stitch for stitch identical to the one I owned a few years ago and the cleaning rod looks authentic. I have two issues with it: how come the stitching is still white after someone slapped on that horrible black dye and why doesn't it have a separate piece of double stitched hinge leather?
Admittedly my holster was dated 2 year later than yours.
Norm