Definitely looks to have had some work done possibly to restore rusted and pitted surfaces. Seems the small parts; screws, magazine latch, safety wing, rear sight etc. have been flame blued after having been cleaned up and polished, typical colouring when steel is heated to blue. Rest of rifle does look to have been sand blasted. Colour wise a bitzer but a nice original and could be properly restored I guess. Should be a nice shooter.