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CD 196
Hemingray №51
Insulator Facts

Dimensions:5 1⁄2" H × 4 1⁄4" W
Primary Embossings: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.
Years Produced: c.1910s
Style Identifier:Hemingray often used style numbers, letters, words, or a combination to differentiate their insulator styles (such as: T.S., E2, № 1 Provo Type, Muncie Type, etc.) These are often, but not always, embossed on the insulator.
51
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)
Uncommon (5/10)
Usage: Telephone (Transposition)
Trade Name: Perfect Transposition
Hobby Nickname: Tramp
Value Range: This is an estimated value range only, based on historical hobby collecting data. Insulator values vary widely depending on many factors, including embossing, color, condition, mold variations, manufacturing anomalies, and other attributes. Please visit the Hemingray Values page for more information.
$75-15000
Insulator Overview

This large one-piece style, marketed as the "Perfect Transposition", is more commonly found with the H.G.Co. embossing (in stark contrast to CD 201). Transposition styles were used for swapping the positions of two lines. This would reduce the interference that would otherwise be caused by two lines running parallel to each other for too long a distance.

Related Links:
Known Embossings (10)
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. [005] (Dome) H (F-Skirt) H.G.CO. (R-Skirt) PAT. MAY 2 1893 SDP - No Photo-
H.G.CO. [010] (F-Skirt) H.G.CO. (R-Skirt) PAT. MAY 2 1893 SDP - No Photo-
H.G.CO. [015] (F-Skirt) H.G.CO. (R-Skirt) PATD MAY 2 1893 {Variation has RDP on the umbrella and SDP on the skirt} SDP - No Photo-
H.G.CO. [020] (F-Skirt) H.G.CO. (R-Skirt) PATD MAY 2 1893 SDP - Photo
H.G.CO. [030] (F-Skirt) H.G.CO. (R-Umbrella) PATENT APPLIED FOR (R-Skirt) PATD MAY 2 1893 SDP - Photo
H.G.CO. [040] (F-Skirt) № 51 / H.G.CO. (R-Skirt) PAT. MAY 2 1893 SDP - Photo
H.G.CO. [045] (F-Skirt) № 51 {'N'/'[Backwards N]' and '1'/'[Backwards N]'}/H.G.CO. (R-Skirt) PAT.MAY 2 1893 {'3'/'3'} SDP 2019 No Photo
H.G.CO. [050] (F-Skirt) № 51/H.G.CO. (R-Skirt) PAT.MAY 2 1893 {Note there is a "3" offset and stamped over the "3"} SDP 2015 No Photo-
HEMINGRAY [010] (F-Umbrella) HEMINGRAY (F-Skirt) HEMINGRAY (R-Skirt) № 51 SDP - Photo
HEMINGRAY [020] (F-Umbrella) HEMINGRAY (F-Skirt) № 51 (R-Skirt) HEMINGRAY SDP - Photo
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 Colors (16)
ColorThe color of the insulator.
Aqua
Blue Aqua
Dark Aqua
Dark Blue Aqua
Gray Green
Gray Purple
Hemingray Blue
Ice Aqua
Ice Blue
Ice Green
Light Aqua
Light Purple
Milky Aqua
Milky Blue Aqua
Purple
Purple/Sage Green Two Tone