William, i am thinking like the others now, may have to change my mind and go with pelt then possibly Vitro. As i review the great photos and study it more everyone may be right on Peltier for this example. I will go into my collection and look and see what i find that is close to yours. Discussing examples like this is the (key) for all of us to learn, as we all (including me) keep an open mind to change. A real (wonky) whacked out example. There are so many oddities in the production of marbles, who actually knows what may be floating around, real (head scratchers) for sure. Chuck G---