Bought this this morning from an older collector who says his best guess is Lithuanian Luger holster from WWII. No markings that I can find.
https://www.milsurps.com/images/impo.../dTAxEsk-1.jpg
https://www.milsurps.com/images/impo.../tQHaXKS-1.jpg
https://www.milsurps.com/images/impo.../8pxAjKJ-1.jpg