U-2121: Germany

3 3/4" X 4 1/4" (94mm X 109mm)

 

(dome incuse)

          

{Agrob AG}

 

Picture courtesy Bob Berry

3 5/8" X 4 1/4" (89mm X 109mm)

 

(dome incuse)

                      A 983

{Maker unknown}

 

Picture courtesy Bob Scafe

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


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