Champion didn't ever make marbles that big. The only time they made 3/4" or so marbles was the NOFs and the biggest one of those I ever saw was about 7/8" but it was messed up in the pattern because it was oversized.
??? Looks similar but different. Pattern too. If it is one, it's not the typical one that I think of when someone says seafoam. Maybe it was made early or late in the run or is it Alley? An odd one and I don't know how to answer.
I agree, Pelt rainbo in an uncommon color for the first, second I lean more Cairo but Heaton and Cairo can be very similar. Definitely machine made. And unknown transparent WV swirl for the last.
I think the first one is similar to some Alleys but the cuts look Akro. I'd probably have it with Akros.
Chris, I think your handful is Akros for the most part but the one that jumps out as probably Alley is the one near the tip of your pinky finger.