U-1647: Spain

2 1/4" X 3 1/4" (55mm X 80mm)

 

(dome incuse)

(dome inksamp) 10    

{Maker unknown}

 

Picture courtesy Bob Berry

2 3/8" X 3 1/4" (58mm X 80mm)

 

 

No markings

 

 

 

Picture courtesy Bob Berry

2 3/8" X 3 1/4" (58mm X 80mm)

 

 

No markings

 

 

 

Picture courtesy Bill Ostrander

U number assignment from Worldwide Porcelain Insulators 1986 Supplement by Marilyn Albers & Jack Tod.


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