Blue Marble Shift Knob Swirl Slag Glass Great For Rat Rod Vintage

This is a vintage marble blue slag glass shift knob. It has a threaded insert on the bottom to thread onto a shifter. Please see photos for all measurements and exact condition. Great blue swirl design. This is in used condition and shows some surface scratches and imperfections. It would go great on a rat rod to give it a unique look with some patina. I put this under a black light and it was not reactive to it.