U-1388: Russia

2 3/4" X 3 7/8" (68mm X 95mm)

 

 (skirt incuse) / "illegible"

{maker unknown}

 

Picture courtesy Bob Scafe

3" X 4" (74mm X 98mm)

 

 (front skirt ink stamp) 5 04

(rear skirt ink stamp) 1 04

 

.

Picture courtesy Bob Scafe

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


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