Here is an insulator that I think very few will ever find. CD 147 BF made spiral groove with moderate white smoky swirls and veils around most of the insulator. I always wondered if one of these existed and have found them with amber, bubbles, spit, metal and snow in them, but never smoky until now. In the sunlight, the smoke really shows nicely. Condition is VVNM with a perfect spiral groove.