Odd Black Glass Pendant Bead with knob for attachments. 11x11x9mm. Pkg of 5. B11-BW-0611

Vintage black glass pendant beads. Very unusual maybe even bizarre shape. These beads have a hole along the top (which is flattened) going from side to side for stringing. On the front (maybe the back?) they have a round "doorknob" around which a wire could be wrapped for attaching things. They'd make a great fringe style necklace. 11x11x9mm. Czechoslovakia. Package of 5.