Soft shell holster made in brown compressed paper/resin except the closure strap which is in (brown) leather, and a white interior finish (assembling early 40 ies).
It has been designed for the ASTRA 400 pistol and is very (very) rare !
No markings at all.
This holster is detailed in the book WW2 German Military Holsters on page 278.
This is the ONLY I have ever seen, except in books !