I'm a bit of a magpie with costume jewellery and started collecting foiled beads a long time ago. Mainly to wear, not really as a collection. Which is just as well - the origins of beads are almost impossible to track down, there is very little knowledge about them at all - and many were made in cottage style industries - made using lampwork.
These ones are cut, but again, there is very little known about origins.
As these have been restrung, it is perfectly possible the spacer beads came from something else old. Charity shops do sell bundles of old broken strings of things for crafty folk. (or they used to!)
It was Andy McConnell and Judith Miller told me the above, when I took all my beads to the AR.
They do have decorative value, and they are popular.