U-3221: Japan

5 5/8" X 8 3/8" (143mm X 212mm)

 

(dome inkstamp)

                          NGK

                         JAPAN

                         79

{NGK}

 

Picture courtesy Craig Polkinghorne

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

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