CD 131.1 Electrical Supply Co.

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CD 133.1 Electrical Supply Co.

Two insulators have the Electrical Supply Co. name on them: the CD 133.1 and the CD 134. Listed below is information on the CD 133.1. All the listings below are found on smooth base (SB) glass insulators with a mold line over the dome (MLOD). In an 1888 catalog for the company, the CD 133.1 is listed as the company's catalog number 904. Although the CD 134 with the catalog number of 905 can be found with that catalog number, to date, no CD 133.1 with the 904 catalog number has been reported.

Reported numbers on the front crown include 22, 25, and 26.
Dates under colors indicate the year the color was first listed in a price guide.

Index	Front Crown	Front Skirt	Aqua	Light Aqua	Light Blue	Green Aqua	Light Green	Green	Light Yellow Green	Yellow Green
005*	[Number]	THE ELECTRICAL SUPPLY Co. CHICACO [Note spelling]	2003*
	26	THE ELECTRICAL SUPPLY. Co CHICACO [Note spelling of "CHICACO," period after "SUPPLY" and no period after "Co"]	Yes
010	[Number]	THE ELECTRICAL SUPPLY Co. CHICAGO	1991	1991	1999		1991	1995		1999
	25	THE ELECTRICAL SUPPLY Co CHICAGO [Note no period after "Co"]#			1970-Terrill		Mint Green##	Yes
015*	[blank]	THE ELECTRICAL SUPPlY CO. CHICAGO [Note spelling]	2003*		1970-Terrill
	[blank]	THE ELECTRICAL SUPPlY CO CHICAGO [Note spelling of "SUPPlY"] [Note no period after "Co"]###	Yes
020** [030]	[blank]	THE ELECTRICAL SUPPLY CO. CHICAGO	1999	2003	2003	2003	1999		1999
[020]***	[blank]	THE ELECTRICAL SUPPLY Co. CHICAGO	1991	1999	1991	1991	1991

*This listing is not found in the 1999 McDougald's price guide but was added in the next edition published in 2003.
**This listing was numbered as [030] in the 1999 McDougald's price guide but changed to [020] in the 2003 price guide.
***This listing was numbered as [020] in the 1999 McDougald's price guide but deleted in the 2003 price guide.
#In the McDougald's price guide, this embossing is listed with a period after "Co" but the example in my collection does not have a period there nor does the one that sold in the March 2005 Klingensmith auction.
##The mint green color was listed item number 55 in Dwayne Anthony's (Winter 2003) auction catalog.
###In the McDougald's price guide, this embossing is listed with a period after "Co" but the example in my collection does not have a period there.

Where were they used?
    Paul Greaves (2005) found CD 133.1's in "Mexico, at a place called Candelaria (on the ground near an abandoned RR station)."

    John W. Sipprell (1971) indicates that Electrical Supply Co. insulators were found in the Denver Metropolitan area but does not indicate if they were CD 133.1's or CD 134's. Larry Volmer (2005) indicates that the CD 133.1 was found in Denver, Leadville, and Colorado Springs, Colorado. He says that "in Denver, we use to get them off the backs of houses."

    Brent Burger (2005) wrote that "The one I found would have been in the very early 1970's in the Seattle area."

    Joe Maurath, Jr. (2005) stated that back in the spring of 1968 he got a couple of those Electrical Supply Co. signals from a Al Perry, a collector in South Dakota. Al apparantly told Joe that he got a bunch of these signals in the South Dakota vicinity and that "these have been excellent traders which have built up my collection."

Who made them?
    All Electrical Supply Co. insulators were probably made by Brookfield in Brooklyn, New York. Brookfield was in business during the time these insulators were sold by The Electrical Supply Co. (1885-1893), the colors the insulators come in are the same colors that Brookfield insulators come in, Brookfield insulators had a crown number just like the Electrical Supply Co. insulators, and Brookfield insulators from this era had a mold line over the dome just like the Electrical Supply Co. insulators. This relationship has been pointed out by at least three sources (see Case 1971, Klingensmith 2005, and McDougald 1990).

Hobby History.
    These insulators do not show up in a price guide as a CD 133.1 until the 1990 McDougald's price guide. They are listed as a CD 133 in the Milholland's price guides of 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1989, 1986, and 1982. Both the CD 134 and the CD 133.1 are lumped together into the CD 133 category. In 1991, the [010] and the old [020] embossings appear in the McDougald's price guide published that year. In the 2003 McDougald's price guide, two new embossings were added and the light yellow green color. From the three pieces I have closely examined under a lighted magnifying glass, there is not a period after the "CO" in the embossing despite what is listed in the price guide. At least one of these pieces also has other puncuation variations.

Price Trends

CD 133.1 [005] /{Known as CD 133 in early books}(dome) [number] (front skirt embossing) THE ELECTRICAL SUPPLY Co. / CHICACO [Note spelling], smooth base, mold line over dome.

Date	Aqua
2003	20-30

CD 133.1 [010] /{Known as CD 133 in early books}(dome) [number] (front skirt embossing) THE ELECTRICAL SUPPLY Co. / CHICAGO, smooth base, mold line over dome.

Date	Aqua	Lt. Aqua	Lt. Blue	Blue	Lt. Green	Green	Yellow Green
1969	20
1970			40-Milholland 15-Terrill
1972			25
1973				25	25
1974				28	25
1975	25
1976	19				25
1977	16				20
1979	18				17
1982	18				20
1986	18				20
1989	24				30
1999	20-30	20-30	20-30		100-125	175-200	200-250
2003	20-30	20-30	20-30		100-125	200-250	250-300

CD 133.1 [015]/{Known as CD 133 in early books} (front skirt embossing) THE ELECTRICAL SUPPlY CO. [Note spelling] / CHICAGO, smooth base, mold line over dome

Date - Source	Aqua	Blue
1970 - Terrill		15
1973 - Milholland	25
2003 - McDougald	20-30

CD 133.1 [020]/{Known as CD 133 in early books}(front skirt embossing) THE ELECTRICAL SUPPLY CO. / CHICAGO, smooth base, mold line over dome

Date	Aqua	Light Aqua	Light Blue	Green Aqua	Light Green	Lt. Yellow Green
1969	20
1970			40
1972			25
1973	25
1974		20
1975	20
1976	19
1977	16
1979	19
1982	20
1986	20
1989	25
1999	20-30	20-30	20-30	20-30	100-125	150-175*
2003	20-30	20-30	20-30	20-30	100-125	150-175

*Small "o" in "Co."

References

Anthony, Dwayne. (Winter 2003). Auction 15. Highland, CA. Website: www.open-wire.com.

Burger, Brent. (9 March 2005). Personal e-mail.

Case, Richard. (Ocober 1971). [Letter to the Editor]. Insulators: Crown Jewels of the Wire Vol. 3, No. 8: 30.

Greaves, Paul. (7 March 2005). ICON posting.

Klingensmith, Ray. (March 2005). Catalogue of Scare, Rare & Colorful Insultors. Sale No. 52. Cambridge, OH.

Maurath, Joe, Jr. (9 March 2005). ICON posting.

McCaffrey, Janet. (8 March 2005). Personal e-mail.

McDougald, John and Carol. (1990). A History and Guide to North American Glass Pintype Insulators. St. Charles, IL: Privately published.

McDougald, John and Carol. (1991). Price Guide for Insulators - A History and Guide to North American Glass Pintype Insulators. St. Charles, IL: Privately published.

McDougald, John and Carol. (1995). Price Guide for Insulators - A History and Guide to North American Glass Pintype Insulators. St. Charles, IL: Privately published.

McDougald, John and Carol. (1999). Price Guide for Insulators - A History and Guide to North American Glass Pintype Insulators. St. Charles, IL: Privately published.

McDougald, John and Carol. (2003). Price Guide for Insulators - A History and Guide to North American Glass Pintype Insulators. Sedona, AZ: Privately published.

Milholland's Insulator Price List. (circa 1969).

Milholland's Suggested Insulator Price List and Index for Book #2. (September 1970).

Milholland's Suggested Insulator Price List. (1972).

Milholland's Suggested Insulator Price List. (1973).

Milholland's Suggested Insulator Price List. (1974).

Milholland's Suggested Insulator Price List. (1975).

Milholland's Suggested Insulator Price List. (1976).

Milholland's Suggested Insulator Price Guide. (1982). Ed. Paul Keating. Tacoma, WA.

Milholland's Suggested Insulator Price Guide. (1986). Ed. Paul Keating. Tacoma, WA.

Milholland's Suggested Insulator Price Guide. (1989). Ed. Paul Keating. Tacoma, WA.

Sipprell, John W. (October 1971). "List of Insulators Found in the Denver Metropolitan Area." Insulators: Crown Jewels of the Wire Vol. 3, No. 8: 22.

Terrill, Frances M. (1970). Rare Insulators with Prices. Book One. Portland, OR: Privately published.

Volmer, Larry. (8 March 2005). ICON posting.