For big ones, we just know that there are limited choices. If you have a slag that comes in at over one inch, I believe we're looking at MFC, for example.
Akro made one-inch marbles, but not in all their styles. Show me a one-inch Akro Popeye or Akro Sparkler and I will keel over.
If you have a swirl of that size and it's vintage, you're almost certainly talking Alley. If modern then we look to Jabo or Vacor.
The facts aren't that fresh in my mind for Masters. I was very interested in the discussion around the year 2008 and I learned a lot about it, but much of what I have learned has gone from detailed knowledge into general impression mode, if that makes sense. And my general impression was that I would have been surprised to see a Master in those colors and textures at such a large size. And then of course I do recognize the color combo and the Master-like structure as being in the general range of my favorite Vacor, the Sunset.