Ok, granted it's NOT an insulator, however, the glaze pattern is incredible! I think it's a gear shift knob of some sort as it fits a manual trans shifter decently with assistance of an adapter. Just imagine if you were to find an insulator with this type of patterning? Update: I was told that this is an antique porcelain door knob. Still, it would make a cool shifter knob for a classic muscle car or truck.