U-1931: England

3 3/4" X 4 1/4" (95mm X 105mm)

 

No markings 

{found in Wabash Cambs}

 

Picture courtesy Gene Kingsley

37/8" X 4 3/8" (98mm X 117mm)

 

No markings 

.

 

Picture courtesy Russ Firth

This is a Sinclair Aitkin side knob dryspot style where the inner skirt unscrews to allow a wire to pass through.  U number assignment from Worldwide Porcelain Insulators 1986 supplement by Marilyn Albers & Jack Tod.


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