John, Christine, thank you very much for your comments!
I am sure it is glass fibre, but I have not idea how the weaving was done.
I add another close-up of the decor -- though ultra fine, the "lacework" seems to be done by hand.
(Very different to the machine-made fabric used in the Harrtil pieces)
I was aware that it is a top piece when I bought it, but not of the prizes asked...
Michael