I'm getting a newer feel from the top one. Thinking Vacor.
I think vintage on the bottom. Not Pelt though. I'm thinking Vitro. Akro would be my second guess, but I'm going pretty solidly Vitro.
With the long seam and the faint white ribbons occurring on both sides, I could see why you might think of Peltier.
The long seam takes me away from my first Master thought. Right now I am leaning toward Vitro.
I'm glad you mention this. I thought about African beads and about them maybe not having been made in Africa, but couldn't remember any details about where they came from.
Interesting. I have one with similar colors. And mine is also an interesting one because it's a "single seam" cat's eye. I find the colors ... let me say, unfortunate. I wish my single-seamer had more eyecatching colors. Will go look for a pic ....
Marbles from Africa? That's another good question. I can't remember if I've ever heard of them. My first thought would be marbles made for Codd bottles. For some reason that image pops to mind.
As to your first question, in my Scrabble group people were speaking of something negative associated with Nigeria, and the group administrators were concerned about Nigerian members feeling stigma from that.
That made me think of how in our marble groups, we speak of something negative associated with Bulgaria. And that got me to thinking about how Bulgarian collectors might feel after reading it. And that got me to wishing we had some Bulgarian collectors.
No real connection! Just my wandering thoughts.
Yes, that was one which leaned toward a Vitro pattern but which I thought was probably MK, and now I'm a solid yes on MK.
The red, white and blues in your second group of pictures are in the same boat. Vaguely Vitro pattern, but still MK.
I just saw someone in a facebook gaming group make a plea for people to be sensitive to the fact that there were Nigerian members in the group. Apparently there had been a lot of talk about Nigerian scammers, which had led to a broad sense of disrespect toward Nigerians, which was sad for the Nigerian fans of the game.
That got me wishing we could get some marble collecting perspective from Bulgarians which would somehow get us deeper into the marble history of that part of the world than we have been able to get so far with the presumably contemporary Bulgarian handmades.