U-1663: Vietnam

2 3/8" X 3 1/8" (70mm X 77mm)

 

No markings

{Dry Process}

 

Picture courtesy Bob Berry

2 3/8" X 3 1/4" (70mm X 80mm)

 

No markings

.

 

Picture courtesy Bob Berry

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


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