U-1816: Korea

1 3/4" X 2 3/8" (45mm X 61mm)

 

(ear inkstamp) 

{Maker unknown}

 

Picture courtesy Bob Berry

2" X 2 1/4" (51mm X 58mm)

 

 

No markings

 

 

Picture courtesy Bob Berry

U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.


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