Spiral Groove & Cork Screws

Cork Screw & Sprial Groove group

For a long time the CD 147 Spiral Groove insulators have been considered by the hobby as being near the bottom of the food chain. They are so common that few collectors have much interest in them. However, there are some rarities among this group and they can be somewhat valuable. Quite some time ago I acquired a few outstanding examples while going through five or six, 55 gallon drums full of 147s and other fairly common pieces.  Of that group, the premier piece

CD147 with stuff

is one that possesses steam like and graphite like inclusions. These features would make this example a winner in most collector's eyes. Some of the others have a large amount of amber and/or olive green streaking and snot which also makes them desirable. Because of these finds I started to look for more and have since acquired a very large collection of CD 147s. Sometime later, after enduring the good natured taunts of fellow collectors, including my own Nephew, I began to take the study of this CD seriously. CD147 with snot

Because I looked at so many different insulators I noticed that there are a lot of different embossing variations, some of which are not mentioned in the current books and price guides. I do not intend to fully discuss the differences here but I have provided a link to a more thorough study of this CD. 

While acquiring 147s I expanded my interest to all Spiral Groove types and now include the Cork Screws in with this interest. As can be seen in these pages I am trying to acquire each and every example of an insulator with a Spiral Groove or Cork Screw top. The only one I do not expect to have eventually is the CD 150 BARCLAY as there is only one (1) example known and it is permanently at home in a private collection. 

New Eng. Tel. & Tel. Co.
New Eng. Tel. & Tel. Co.

National Insulator Co.
National Insulator Co.

Included in my collection are examples of the CD 110, 110.5, 110.6, every known variant of the 147s and a BROOKFIELD 150. All of these are shown in the pictures included on this page. I will give a brief discussion of each type and show some of the more interesting examples of the 147s. These include pieces with holes and/or indentations in the skirts caused by an under pour, inclusions (junk in the glass), crude mold lines, etc.

CD110 in Green ( scarce)
CD 110 in Green (scarce)

CD 110.6 (scarce)
CD 110.6 (scarce)

CD 150 (uncommon)
CD 150 (uncommon)

I might also explain that I am not being arrogant by referring to the 147s as the Sinsley Spiral. This is a name affectionately given them by my friends on Insulator Collector's On the Net. (ICON) That came about after I offered information about the 147s and bombarded them for information about which variants they had seen. Some also refer to me as the Spiral Groove Guru. This is all in fun. 

Please look at the pictures, enjoy and feel free to e-mail me if you have questions or if you think you might have something I am not aware of. I am always open to trading for or buying outright something I don't have. If you want to keep it that is fine, just let me know it exists.

 Click here for Additional Pictures

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