they or some of them may originally have been made in China or elsewhere -

i have some in an image from my new book, p. 8:

the short loop to the right with a small bell has old heirloom beads but the long traditional strand consists of fairly recently made beads in the locally favoured patterns -most distinct are the newly made black oblates decorated with twisted-cane circles or eyes on a string of their own, "Lukut Sekala" beads. Glass skillfully lamp-worked in villages in Java- which have been visited by some BCN members ...

however my computer doesn't want to let me reduce the image size so now i'm not able to show the picture...