A.E.R. (Canada)
Algoma Eastern Railway

AI (England)
Allied Insulators

API (Australia)
Australian Porcelain Insulators

Bulgaria (Bulgaria)

Bullers (England)

CP (Canada)
Canadian Porcelain

C.P.R. (Canada)
Canadian Pacific Railway

C.N.R. (Canada)
Canadian Northern Railway

DIA (Australia)
Doulton Insulators Australia

Dalian Insulator Works (China)

FIL (Italy)
Fabbrica Isolatori Livorno
(Livorno factory Insulators)

Manufacture Embossings:
FIL
Lot Number - Year

G.F. (Australia)

G.P.O. (Ireland)
General Post Office

Johns-Manville (USA)

KP (Australia)
Koster Potteries

NP (Canada)
National Porcelain

R.F. LTD (Australia)

Richard Ginori (Italy)

S&S (Canada)
Smith & Stone

Sunshine (Australia)

T & NO RLY (Canada)
Temskaming & Northern Ontario Railway

Verbano (Italy)

Manufacture Embossings:
Verbano Logo
Month - Year
Lot Number