Good to know, I don't have one.
Getting back to the OP bit, despite all the similarities, including the correct shade of amethyst, I
really don't think the consensus is that it could be Mdina, not even an early "experimental" bit. There is too much wrong about it too.
I trust my guts on this pretty much, I also trust John' guts. Although it has to be admitted, John and I have had our disagreements in the past, when both our sets of guts say NO, I'd trust them even more.
Thar doesn't mean it couldn't be something from the early days of the Studio Glass Movement... or Hebron.
I just don't know. Sorry.