I appreciate your thoughts! We are all trying to learn more about what we love; marbles. I definitely agree that some marbles are considered a specific “type” or have a specific name, but that doesn’t mean they are equally desired by collectors. Marble-on!!
Even though there is some “feathering” in the second photo, I don’t think it is as fine and delineated as it should be for a Peltier. I think it is Akro, IMHO.