Cool marble, it looks like a Bennington type to me. Some of them have that shiny, almost iridescent metallic-looking, glaze that is quite different than the more typical ones. At least, I think that's what I'm seeing here. ๐
If you look at the first pic you can see that the green up on the right hand side actually originates below the seam you're showing - it should be laying just to the right of that red ribbon below the seam., then you've got a pretty typical "flip-flop" pattern, even though the ribbons are wandering all over the place.
I have some huge Asian Cat's Eyes that look really similar, and I have seen similar looking and sized Cat's Eyes (Taiwan) packaged by Shackman in "Six Jumbo Kate Greenaway Marbles" boxes. They also packaged some (Japan) in "Super Deluxe Jumbo Multicolor Marbles" boxes but I think they were mostly single-color ones.
Cool marble - kind of odd. It appears to have way more than it's fair share of white, and it's hard to tell, but it does kind of look like a crude folded "pontil". How would you classify it?
I really like the fatties too. It seems like fat vanes are more common in the older 5-vane Vitros than the 6-vane ones. I don't seen many hybrid fatties either. The one you posted is a really nice example.
Ha, and thanks for the Cat Soup and link to Ohara. I have a soft spot for artists and I really enjoyed looking around her site. She seems like a super interesting person and she is obviously very talented. ๐