I am not an expert by any means so I reserve the right to be wrong.
This is not a P-08 or P-38 Luger holster IMHO.
My guess is it is possibly a CZ-24, CZ-27, Walther PP or PPK holster.
It most definitely is a very interesting and a very nice holster.
Many thanks for showing us vesuvio.
Jerry Burney aka:lugerholsterrepair will know I think