These are hard-to-find vintage, handmade foiled glass beads, dating from the 1920s or 1930, either of Czech or Japanese origin. They are handwound with foil and glass overlay.
These beads are made with black glass with foil overlay in a 12mm disc shape. The foil is silver color and overlaid with clear crystal. Since these beads are handwound, there can be some irregularity in size/shape. pk/4