Yes, I checked out that article earlier too. I don't know a lot about them so I thought I'd look. From memory all of the rifles I've seen over the years had a letter (usually A?) prefix followed by the number, & I thought the few I'd seen had had the receivers linished (though not perfectly in all cases) of original markings, before the new nomenclature (be it N9 or No9) was applied. The rifle in question here looks a peach & does not look as though it is a recent creation, but I have never seen a No9/N9 with its original markings & original No4 serial number before. Can anybody enlighten us (me)?