Very old real marble shift knob. Interesting rust colored veins. Has a threaded insert. Neat original accessory, would look great on your ruckstell shifter. 40.00 plus shipping.
I'll take it Ed and that's exactly where it going, Ruckstell shifter. I'll PM you for further info, thank you
BTW Ed: that threaded insert is called a "heli-coil", check is in the mail !!!