I'm not sure how long Master used the name "Comet".
The later Masters started having less defined colors and more random combos in comparison to the sharper colors in the first Masters. So, I this is a later marble and I don't know what Master would have called it.
I'm wondering about Jabo, but that's a lot of color shading for a 5/8" Jabo. At least if it's from the Classic era.
It's a lot of color shading for anybody, come to think of it.
In the first photo, top left might be Vitro. Need more views on that one and the bottom left one and the middle one.
I think Asian on the rest of them, even that interesting one with the blue ribbons.