Winchester (?) swivels maybe. I think they came in two widths,,the Super Grade was a bit wider than the standards.
I see a lot about the rifle that would cause me to stop and look at it were it sitting on a table at a show.
Not that I know anything about it's builder,,there's nothing there that would jump out at me, not that I'm any sort of knowledgeable collector or expert.
A few I would know,,quality is clear no matter the source.
I'd be interested for what it was,,the potential to be,,the asking price,,and I'd be looking to rebuild what was there.
But that's just me..
I don't see it as that nice of a looking sporter in the way it's shaped out right now.
But it has potential..
So I'd be destroying some sort of holy grail ??