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Pole Top Discoveries' Event #2404
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#3738 CD 110.5 NAT. INSULATOR CO. "Corkscrew." Aqua. 
- Sold Winning Bid: $130.00
- 7 Bid(s) View Bid History
- Lot # 3738
- System ID # 798176
- End Date
- Start Date
#3738 CD 110.5 NAT. INSULATOR CO. (multiple patent dates). Aqua.
Regular threads. The small "Corkscrew."
The fully threaded type is actually a fair amount scarcer than the segmented thread version.
Most examples of this uniquely shaped insulator currently in collections were recovered along the route of a long distance telephone line constructed by American Telephone & Telegraph Company between New York City and Philadelphia, Pennsylvania.
The unusual insulator design was patented by Joseph Lewis in 1883 (see third image). The concept involved a spiral top which received a horse shoe shaped clip, which facilitated rapid attachment to the line wire without using a standard tie wire.
First photo depicts the actual insulator offered. Second image is a stock photo depicting the same embossing configuration.
A neat rectangular indent is molded into the lower skirt (shown to left of center in first photo). Apparently a piece of metal of other object was adhered to the mold side when the glass was pressed, creating this unique and interesting feature.
All base embossing is intact. Remainder of insulator is quite nice, with only a thin, pencil eraser flake up from base and two, slightly larger than match-head size blemishes on the ridges.