
Sorry, I just keep posting and posting. I'm having so much fun with this thread. I like the reverse engineering too, Mt Paul.
And 3 professional blowers in the thread! Thank you all very much for contributing, and a big wecome to the forum to Tom and Mt Paul!

With no experience with hot glass, I need someone to rein in my imagination. My idea about how the disks were made, for instance. Forget for a sec whether they really were made like this, would it hypothetically be possible to
- paint a glass rod with enamel
- heat it until malleable
- bend it into a circle and press it flat
- and marver it into an object?
Would it work, and if not, why not?
Please, I'd really like to know more about what you guys are calling enamel, and how it's different from frit. If the enamel were suspended in a liquid of some kind, could you paint it on? Same basic ingredients and result, just applied wet or dry?
I just realized something. It's always puzzled me that there were thin, relatively uniform black lines encircling the donuts and rimming their holes. They even extend to the ground areas on the bottom, where they are more noticeable. But if this is acid cutback, the whole thing could have been rolled in black before the disks went on, and all the black but those thin lines removed afterward.