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#1607 CD 143 "Double threaded." Blue aqua. 
- Sold Winning Bid: $625.00
- 31 Bid(s) View Bid History
- Lot # 1607
- System ID # 447178
- End Date
- Start Date
#1607 CD 143 Unmarked. Blue aqua. Double threaded.
The double threaded pinhole is an oddity found in a small number of Canadian insulators. Two threads, positioned opposite each other, spiral from top to bottom. If not familiar with how this feature appears, perhaps the best way to envision the design is to imagine the stripes on a candy cane, that spiral together around and around.
This threading process resulted in the threading mandrel being extracted twice as quickly during manufacture, as well as facilitating twice the speed in turning the insulator off and on a corresponding pin when in service.
Examples of the CD 143 "beehive" with double threads are scarce.
Small "pollywog" in the dome, a few creases on the glass surface and some enclosed bubbles add a little extra character.
A few small blemishes (mostly pinhead to match head size) on the surface. No chips.