Leather to kydex, factory or custom.
Mine is black with the date: 1997-08-25. It has the circle with the KT and a 10 plus other very small writing. It also has a block of writing with: warsza and more that I can not read. It has NOMA in large print then SPOlD?ELNIA ? ALDOW with some unreadable small letters and numbers. It is in new condition.