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Pole Top Discoveries' Event #2403 Closed February 26.
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#2560 CD 270 Unmarked. Blue. 
- Sold Winning Bid: $2,400.00
- 43 Bid(s) View Bid History
- Lot # 2560
- System ID # 601455
- End Date
- Start Date
#2560 CD 270 Unmarked. Blue.
A rare power glass insulator that has been exceptionally elusive in the hobby for decades. Very few examples have changed hands since the insulator collecting hobby became popular decades ago.
Ask any long time power glass collector, and they will confirm how difficult examples are to acquire.
Recently, a group of eight of them surfaced. Apparently, they had been used on an interurban line in Indiana decades ago. Of the group, this was the third best example of the bunch. Five others had moderate amounts of chips and bruises, some of them with fair amounts of damage.
This type insulator was offered in Catalog Number 20 of the C.S. Knowles Company. During the early 1900's, Knowles was a Boston area supplier of various types of insulators, many of which were made in Elmer, New Jersey. The third image above is a page from the Knowles catalog. The insulator illustrated in the catalog is porcelain, but the text on the page states the same design was available in glass, designated as the "No. 3-G Cable."
The crisp blue glass coloration of the CD 270 is consistent with other insulators produced for Knowles. Also present, is the "Elmer Ring," a circular mark at the top of the pinhole.
Displays excellent from the front and both sides. A little conductor rubbing is evident in the saddle groove. Reverse has a pinkie nail chip on the front of one ear. Shallow bruise, just under the glass surface is present on the face, below the top center saddle groove (second photo).
Contrasting colors in the skirt area is not damage. Creases on the glass surface and the inner skirt cavity create light and dark areas.
Overall, a pretty nice example.
Anyone who uses the price guide to determine values..... in many cases, it's accurate. In this case, it's way low in our opinion.