N-TBD: United States (USA)

3 5/8" X 4 1/2" (92mm X 113mm)

 

No markings

 

Picture courtesy Bob Berry

3 5/8" X 4 1/2" (92mm X 113mm)

 

No markings [base view]

 

Picture courtesy Bob Berry

3 5/8" X 4 1/2" (92mm X 113mm)

 

No markings

 

Picture courtesy Ben Kirsten

3 5/8" X 4 1/2" (92mm X 113mm)

 

No markings

 

Picture courtesy Ben Kirsten

These insulators are made from Lignam Vitae, a very hard, heavy and oily wood and were made for use on the San Francisco trolly feeder lines.

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