I have several of the Summarit lens hoods in black crinkle paint finish, code XOONS. But I have one in chrome that I have not seen reported before. Does anyone know if it is original? The engraving looks correct and I don't think it has had the black paint removed and then chromed after delivery. One other difference is shown in the last two photos. Two 1 cm disks are fixed with studs, to ensure the hood is not pushed too far onto the lens. I have not seen these disks on any other XOONS. Any information appreciated.