Johno, it's still pretty dark here and with my new camera, I haven't played with it enough to take good pics. My bluing is about gone, pretty gray with a bit of brown tint. I don't see the rings in the bluing. The bottom of the stud is flat, but the top of the stud where yours is tapered into the ring, mine looks more flat. But, it may look different when I get some good light on it.The front stud was loose so I pulled it out. It goes in the top hole. Here's a couple fuzzy pics.
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I'm not greedy, I just want one of each.

Remember Ira Hayes

JoeMartin