I think that marble of mine which was similar and which I wanted to be Alox was ID-ed as Marble King. I never understood the ID.
But that's why I'm on the edge of my seat to see what yours turns out to be.
I'm leaning Champion on the red one. Again, many would lump it in with "game marbles". I might put it in with them myself in my marble storage. But probably not technically a game marble.
Single color marbles aren't always game marbles. But, yes, one like your right one would often be lumped in with game marbles. If it's bigger than usual game marble size of 9/16", that would be worth noting.
Ravenswood had some nice glowy solid-colored marbles ... but the Ravenswoods would be swirls. So if you are seeing a patch-like pattern with two clear seams, then rule my thought out. But if you're seeing a swirl pattern in the marble, then think about Ravenswood.
When I see a black banana with a clear base, I think Master. But I gather there are some other possibilities, such as Bogard?
I have no idea what aventurine would do to the analysis.
Cool mib.
Does look like Jabo.
On my screen most of the red looks transparent and thus wouldn't be oxblood. But there are some thin ribbons which could maybe be contenders for oxblood.
First thought Vitro. But Marble King had some odd vane shapes/counts in their modern cats. If six or more distinct vanes, I'll go with Vitro.
What does it look like under blacklight? Some of the MK's had a faint blue glow in the base under UV.
so nice
And I really needed an inspiration to get me posting again in the history forum. 1957-08-01 -- Marble King promotional card set - Marble-Related Documents, News, Etc., Especially Items with Dates - Marble Connection