3" X 4 7/8" (74mm X 119mm)
(crown inkstamp) NO. 7 JAPAN {NGK}
Picture courtesy Craig Polkinghorne |
U-1549: Japan
3" X 4 7/8" (74mm X 119mm)
(crown inkstamp) NO. 7 JAPAN {NGK}
Picture courtesy Craig Polkinghorne |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.
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