Glass Insulator Markings
Markings (Country)
Meaning of markings
Logo
If applicable
A.A. (Mexico)
Unknown
A.G.E.E. (Australian)
Australian Glass
No Logo
Text only Embossing
A.G.M. (Australian)
Australian Glass Manufacture
No Logo
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A.T.& T.CO. (USA)
American Telephone & Telegraph
No Logo
Text only Embossing
A.U. (USA)
American Union
No Logo
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AM.INSULATOR CO. (USA)
American Insulator Company
No Logo
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AM.TEL.& TEL.CO. (USA)
American Telephone & Telegraph Company
No Logo
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ARMSTRONG (USA)
AYALA (Mexico)
Unknown
BARCLAY (USA)
No Logo
Text only Embossing
B & O (USA)
Baltimore & Ohio
No Logo
Text only Embossing
B.C.DRIP (Canada)
Unknown, Maybe British Columbia?
No Logo
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B.E.L.CO. (USA)
Unknown
No Logo
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BEAL'S (USA)
No Logo
Text only Embossing
B.F.G.CO. (USA)
Beaver Falls Glass Company
No Logo
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B.G.M.CO. (USA)
Baltimore Glass Manufacturing Company
No Logo
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BIRMINGHAM (USA)
No Logo
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Borgo (Italy)
No Logo
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BOSTON BOTTLE WORKS (USA)
No Logo
Text only Embossing
B.T.C. (Canada)
Bell Telephone Company
No Logo
Text only Embossing
B (USA)
BROOKFIELD (USA)
Brookfield
No Logo
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BROOKE'S (USA)
No Logo
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BUZBY (USA)
No Logo
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C.& P.TEL.CO. (USA)
Chesapeake & Potomac Telephone Company
No Logo
Text only Embossing
C.C.G. (Australian)
Crown Crystal Glass Company Ltd.
No Logo
Text only Embossing
C.D.& P.TEL.CO. (USA)
Central District & Printing Telegraph Company
No Logo
Text only Embossing
C.E.L.CO. (USA)
Cambridge Electric Light Company
No Logo
Text only Embossing
C.E.W. (USA)
CAL.ELEC.WORKS (USA)
California Electric Works
No Logo
Text only Embossing
C.G.I.CO. (USA)
California Glass Insulator Company
No Logo
Text only Embossing
C.N.R. (Canada)
Canadian Northern Railway
No Logo
Text only Embossing
C.P.R. (Canada)
CANADIAN PACIFIC RY.CO. (Canada)
Canadian Pacific Railway
No Logo
Text only Embossing
CABLE (USA)
No Logo
Text only Embossing
CALIFORNIA (USA)
No Logo
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CANADA (Canada)
No Logo
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CHAMBERS (USA)
No Logo
Text only Embossing
CHESTER (USA)
No Logo
Text only Embossing
CHICAGO INSULATING CO. (USA)
Chicago Insulating Company
No Logo
Text only Embossing
CIA COMERCIAL (Mexico)
Compania Comercial
(Commercial company)
No Logo
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CIA TELEFONICA (Mexico)
Compania Telefonica
(Telephone company)
No Logo
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CIN COM (Cuba)
Unknown
No Logo
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CITY FIRE ALARM (USA)
No Logo
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CLIMAX (USA)
No Logo
Text only Embossing
COLUMBIA (USA)
No Logo
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COMBINATION SAFETY (USA)
No Logo
Text only Embossing
CONVERSE (USA)
No Logo
Text only Embossing
CRIMSA (Mexico)
No Logo
Text only Embossing
CRISA (Mexico)
No Logo
Text only Embossing
CRISOL TEXCOCO (Mexico)
Logo
Photo Wanted!
CROWN (USA)
No Logo
Text only Embossing
CTC (Mexico)
Unknown
No Logo
Text only Embossing
D.T.CO. (Canada)
Dominion Telegraph Company
No Logo
Text only Embossing
DERF (Mexico)
DERFLINGHER (Mexico)
Derflingher
No Logo
Text only Embossing
DIAMOND <> (Canada)
DIAMOND P (USA)
DOMINION (Canada)
DRY SPOT INSULATOR (USA)
No Logo
Text only Embossing
DUPONT (Canada)
No Logo
Text only Embossing
DUQUESNE (USA)
No Logo
Text only Embossing
DWIGHT (Canada)
No Logo
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E.C.& M.CO. (USA)
Electrical Construction & Maintenance Company
No Logo
Text only Embossing
E.D.R. (Canada)
Edmonton Dunvegan Railway
No Logo
Text only Embossing
E.L.CO. (USA)
Edwin Lewis Company
No Logo
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E.N. TEL. Co. (Agrentina)
State Telephone Company
No Logo
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E.R. (USA)
Erie Railway
No Logo
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E.R.W. (USA)
Erie Railway Western
No Logo
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E.S.A. (Spain)
Esperanza S. A.
No Logo
Text only Embossing
E.S.B.CO. (USA)
Electric Storage Battery Company.
No Logo
Text only Embossing
E.S.S.CO. (USA)
Electrical Service & Supply Company
No Logo
Text only Embossing
EIV (France)
Europeenne d' Isolateurs en Verre
(European Insulators made out of Glass)
No Logo
Text only Embossing
ELECTRICAL SUPPLY CO. (USA)
Electrical Supply Company
No Logo
Text only Embossing
EMMINGER'S (USA)
No Logo
Text only Embossing
ERICSSON (Mexico)
No Logo
Text only Embossing
FALL RIVER (USA)
No Logo
Text only Embossing
F.F.C.C.N.DE M. (Mexico)
Ferrocarriles Nacionales de Mexico
(National railroads of Mexico)
No Logo
Text only Embossing
FISHER (USA)
Frank E Fisher
No Logo
Text only Embossing
FIDENZA (Italy)
Manufacture Embossings:
2205 means 2 two shells
2 two parts
05 rating 5 kV (previous numbering system)
6205 means 6 series 6000 (early '60s)
2 two parts
05 rating 5 kV
low voltage 6118 6 means series 6000
1 bell type
18 cat. number
UNEL: unificazione elettrotecnica
No Logo
Text only Embossing
FLOY (USA)
No Logo
Text only Embossing
FOSTER (USA)
No Logo
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FLUID INSULATOR (USA)
No Logo
Text only Embossing
FT.W.E.CO. (USA)
Fort Wayne Electric Company
No Logo
Text only Embossing
G.E.CO. (USA)
GENERAL ELECTRIC CO. (USA)
General Electric Company
No Logo
Text only Embossing
G.N.R. (Canada)
Great Northern Railway
No Logo
Text only Embossing
G.N.W.TEL.CO. (Canada)
GREAT NORTHWESTERN (Canada)
Great Northwestern Telegraph Company
No Logo
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G.P.R. (Canada)
Great Pacific Railway
No Logo
Text only Embossing
G.T.P.TEL.CO. (Canada)
Grand Trunk Pacific Telegraph Company
No Logo
Text only Embossing
GAYNER (USA)
Gayner Glass Works
No Logo
Text only Embossing
GOOD (USA)
Robert Good, Jr
No Logo
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GREELEY (USA)
E. S. Greeley & Co
No Logo
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GREGORY (USA)
Ferdinand W Gregory
No Logo
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HAMILTON (Canada)
Hamilton Glass Works
No Logo
Text only Embossing
HARLOE (USA)
HAWLEY (USA)
Harloe Insulator Company
H.B.R. (Canada)
Hudson Bay Railway
No Logo
Text only Embossing
H.G.CO. (USA)
HEMINGRAY
Hemingray Glass Company
No Logo
Text only Embossing
H.G.W. (USA)
Houston Glass Works
No Logo
Text only Embossing
HUTA (Poland)
Huta
(Glass Mill)
No Logo
Text only Embossing
JEFFREY MFG.CO. (USA)
Jeffrey Manufacturing Company
No Logo
Text only Embossing
JOHNSON & WATSON (USA)
No Logo
Text only Embossing
JUMBO (USA)
No Logo
Text only Embossing
K (USA)
Unknown
No Logo
Text only Embossing
K.C.G.W. (USA)
King City Glass Works
No Logo
Text only Embossing
KERR (USA)
Kerr Glass Manufacturing
No Logo
Text only Embossing
KIMBLE (USA)
Kimble (Hemingray made)
No Logo
Text only Embossing
KNOWLES (USA)
C. S. Knowles
No Logo
Text only Embossing
L.G.T.& CO. (USA)
Luther G. Tillotson Company
No Logo
Text only Embossing
LAWRENCE GRAY (USA)
Lawrence B. Gray
No Logo
Text only Embossing
LEWIS (USA)
Slater Lewis
No Logo
Text only Embossing
L'ELECTRO VERRE (France)
(Electrical Glass)
No Logo
Text only Embossing
LIQUID INSULATOR (USA)
No Logo
Text only Embossing
LOCKE (USA)
Fred M. Locke
No Logo
Text only Embossing
LOWEX (USA)
Low Expansion--Low Expense
(Hemingray Trade Name)
No Logo
Text only Embossing
LYNCHBURG (USA)
Lynchburg Glass Works
MANHATTAN (USA)
Manhattan Electrical Supply
No Logo
Text only Embossing
MAYDWELL (USA)
Maydwell Glass Co
No Logo
Text only Embossing
MCLAUGHLIN (USA)
William McLaughlin Glass Company
No Logo
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MCKEE & CO. (USA)
McKee & Company
No Logo
Text only Embossing
MEHR (Iran)
Mehr Glass Factory
MERSHON (USA)
R.D. Mershon
No Logo
Text only Embossing
M.& E.CO. (USA)
Mayer & Englund Company
No Logo
Text only Embossing
MINCOM (Cuba)
(Unknown)
No Logo
Text only Embossing
MINE INSULATOR (USA)
(Hemingray Product)
No Logo
Text only Embossing
MIVA (Italy)
Manifattura Isolatori Vetro Acqui
(Acqui Glass Insulators Factory)
Manufacture Embossings:
Acoui: The town in Italy where the Insulators where made
AT: Alta Tensione (High voltage)
BT: Bassa Tensione (low voltage)
CA: Cavo in Alluminio (Cable in Aluminum)
FS: Ferrovie dello Stato (Italian State Railroad Co.)
MT: Media Tensione (medium voltage)
M: (Unknown)
S: (Unknown)
T: (Unknown)
UNES: UNione ESercizi elettrici (old private electric co.)
V: (Unknown)
1xx, 2xx, 3xx series: Seen on Multi Parts, the fist Number is how many parts. for the 1xx it is shaped like a Multipart but is a Unipart (Example the MIVA 1212)
No Logo
Text only Embossing
MONTREAL (Canada)
M.T.CO. (Canada)
Montreal Telegraph Company
No Logo
Text only Embossing
M.T.CO. (Canada)
Montreal Telegraph Company
No Logo
Text only Embossing
N DE M (Mexico)
Ferrocarriles Nacionales de Mexico
(National Railways of Mexico)
No Logo
Text only Embossing
N.A.T.Co. (USA)
North American Telegraph Company
No Logo
Text only Embossing
N.E.G.M.CO. (USA)
NEW ENG.TEL.& TEL.CO. (USA)
New England Glass Manufacturing Company
No Logo
Text only Embossing
N.W.& B.I.T.CO. (Canada)
New Westminster & Burrard Inlet Telephone Company
No Logo
Text only Embossing
N.Y.& E.R.R. (USA)
New York & Erie Railroad
No Logo
Text only Embossing
NATIONAL BATTERY CO. (USA)
National Battery Company
No Logo
Text only Embossing
NATIONAL INSULATOR CO. (USA)
National Insulator Company
No Logo
Text only Embossing
OAKMAN MFG.CO. (USA)
Oakman Manufacturing Company
No Logo
Text only Embossing
O.V.G.CO. (USA)
Ohio Valley Glass Company
No Logo
Text only Embossing
OWENS ILLINOIS (USA)
Owens Illinois
PAISLEY (USA)
PAISLEY
No Logo
Text only Embossing
PETTINGELL ANDREWS (USA)
PETTINGELL ANDREWS
No Logo
Text only Embossing
POSTAL (USA)
POSTAL Telegraph Company
No Logo
Text only Embossing
P. & T. ERITREA (Ethiopia)
(Unknown)
No Logo
Text only Embossing
P & W (USA)
Pittsburgh & Western Railway Company
No Logo
Text only Embossing
P.F.C. (France)
Anciens Etablissements Parvillee Freres & Cie.
No Logo
Text only Embossing
P.L.W. (USA)
Pennsylvania Lines West
No Logo
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P.R.R. (USA)
Pennsylvania Railroad
No Logo
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P.S.S.A. (Mexico)
Patricio Sordo Sociedad Ananimo
No Logo
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PYREX (USA)
PYREX
No Logo
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RUIZ (Mexico)
J.J. RUIZ Y HNOS
No Logo
Text only Embossing
R.Y.T. (Mexico)
(Unknown)
S.A.F.N.V. (Uruguay)
Sociedad Anonima Fabrica Nacional de Vidrio
No Logo
Text only Embossing
SANTA ANA (USA)
SANTA ANA California
(MFG marking of California glass Co)
No Logo
Text only Embossing
S.B.T.& T.CO. (USA)
Southern Bell Telephone & Telegraph Company
No Logo
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SEILERS (USA)
Paul SEILERS Patent
No Logo
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S.F. (USA)
(Unknown)
No Logo
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S.S.& CO. (USA)
Shay, Stephens & Company
No Logo
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SO EX CO (USA)
Southern Express Company
No Logo
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SO.MASS.TEL.CO. (USA)
Southern Massachusetts Telephone Company
No Logo
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STANDARD GLASS INSULATOR CO. (USA)
Standard Glass Insulator Company
No Logo
Text only Embossing
STAR (USA)
(Unknown)
STERLING (USA)
Sterling Glass Co
SURGE (USA)
SURGE
(Babson Brothers of Chicago)
No Logo
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