A grenade launcher for the K98k.  This is a rather scarce accessory that is in exceptional condition.  I doubt that it was ever used.  The pouch is coded cxb which was Moll Lederwarenfabrik, Goch, Rheinland and dated 1942.  There is a small tear in the leather that can be seen the one of the pictures.  Otherwise, this set is about as nice as you would be able to find.  Very difficult to find a complete set.