Agreed, thanks for the insight Alan, interesting discussion. Fantastic marbles pictured. I don't doubt that Sulphides were made in Germany (sorry if you interpreted that out of my post). But it would seem that carving a detailed wooden mold, casting clay in that mold, and making a two part marble would take a bit longer than melting glass? And if there were places that were skilled with the technique they'd have a competitive edge. Kind of like how they don't make Ford and Chevy at the same plant (respectfully, of course)