This is a military type leather holster suitable for a pistol like the Colt M1910, though not the TT-33 which is shown for scale, but won't actually fit as the barrel end is too wide, typical of the type of holster used in WW1 and WW2. This holster looks to have been modified, in that the length had been reduced and a sleeve added as reinforcement. That aside, the leather is in very good condition with perfect stitching, and a pleasant aged look to it. No markings that we can find.