I have a nose cap that looks a Lithgow no1 mk3, but there is no Aussie markings. It does have the holes in the ears just like an Aussie but the markings are, broad arrow over FD over S and is drilled for a stacking swivel. I would include a picture of the markings but they are so small I am unable to get a pic that shows the marks. Hope someone will be able to give me some info about it.