well Irene Cockroft took loan of my necklace as an example in the exhibition she curated in 2010.
what we can't be sure is whether threaded necklaces were made up at the time in Bohemia/Czechoslovakia or if they were made in England from loose Czech beads.
do you know Sibylle Jargstorf? she did a lot of research in documentary archives as well as the museums before publishing her 3 books, and might give an opinion.(she gave a talk to the Bead Soc. of GB in our early days but i don't have a current email for her, sorry).