Hemingray.info
 
CD 317.7
  • Photo credit Bob Berry of NIA.org.
  • CD317.7/314/314
    CD 317.7 was originally thought to have sleeves (CD 314), which have since been identified as Micarta Core suspension sleeves. Photo credit Bill Meier of Insulators.info.
  • Base View
    View showing the base and drip points. Photo credit Bob Berry of NIA.org.
Insulator Facts

Dimensions:4 5⁄8" H × 9" W
Primary Embossing:The Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
H.G.CO.
Years Produced: c.1902
Rarity Scale 0. No specimens known
1. Extremely Common (millions known)
2. Very Common
3. Common
4. Fairly Common
5. Uncommon
6. Very Uncommon
7. Rare (dozens known)
8. Very Rare (less than a dozen known)
9. Extremely Rare (2 or 3 known)
10. Unique (only one known)
Unique (10/10)
Usage: Power (Primary Distribution)
Insulator Overview

This style is similar to the CD 317.8, but is slightly shorter. It is unique in a couple ways: first, it is the only power piece embossed with H.G.CO., and also it only has drip points on the inner skirt. There is only one specimen known. It was discovered by a Hemingray employee in the Hemingray Dump in 1969 along with several other rare and unique Hemingrays. Two Micarta Core suspension sleeves were also discovered at that time, and they were initially thought to belong with this insulator. Earlier insulator books list this multipart combo as CD 317.7/314/314. Once it was discovered that the sleeves did not belong to this insulator, the sleeves lost their CD number, and this piece is no longer considered a multipart.

Related Links:
Known Embossing
Primary EmbossingThe Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
EINThe Embossing Index Number (EIN) is a unique number assigned by the collecting hobby to each distinct embossing for an insulator design. It is normally shown in brackets, e.g. [050].
EmbossingMost common terms:
(F-Skirt): Front Skirt
(R-Skirt): Rear Skirt
/: New line of embossing
{}: Special note (not embossed on the insulator)
[#]: Represents a number

Other terms:
{MLOB}: Mold Line Over Base
(F-Crown): Front Crown
(R-Crown): Rear Crown
(F-Umbrella): Front Umbrella
(R-Umbrella): Rear Umbrella
BaseThe base is the bottom of the insulator. Hemingray made 4 different types of bases:

1. SDP: Sharp Drip Points
2. RDP: Round Drip Points
3. CB: Corrugated Base
4. SB: Smooth Base
Year AddedThis is the year that this embossing was officially recognized and added to the McDougald (1991-2008) or Briel (2011-2023) insulator price guides. It is not necessarily the year this embossing was discovered.
Photo
Status = In my collection

If the value in this column says WANTED, then that specific insulator is on my wanted list! If you have that insulator and would like to sell it, click on the WANTED link to submit photos and contact me.
H.G.CO. [010] (F-Skirt) H.G.CO./PATENT MAY 2. 1893 {Round drip points appear only on the inner skirt} RDP - No PhotoWANTED
Removed Embossing

The following embossing(s) were removed from the price guide because they could not be verified to exist, were consolidated with other embossings, or were otherwise ambiguous/inaccurate. They are preserved here for historical purposes.


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Primary EmbossingThe Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
EINThe Embossing Index Number (EIN) is a unique number assigned by the collecting hobby to each distinct embossing for an insulator design. It is normally shown in brackets, e.g. [050].
EmbossingMost common terms:
(F-Skirt): Front Skirt
(R-Skirt): Rear Skirt
/: New line of embossing
{}: Special note (not embossed on the insulator)
[#]: Represents a number

Other terms:
{MLOB}: Mold Line Over Base
(F-Crown): Front Crown
(R-Crown): Rear Crown
(F-Umbrella): Front Umbrella
(R-Umbrella): Rear Umbrella
BaseThe base is the bottom of the insulator. Hemingray made 4 different types of bases:

1. SDP: Sharp Drip Points
2. RDP: Round Drip Points
3. CB: Corrugated Base
4. SB: Smooth Base
Year Removed
n/a
Known Color
ColorThe color of the insulator.
Aqua