U-2370: Japan
2 7/8" X 3" (73mm X 75mm)
(skirt inkstamp)
Picture courtesy Craig Polkinghorne |
2 7/8" X 3" (73mm X 75mm)
(skirt inkstamp) NGK JAPAN
Picture courtesy Bob Berry |
2 7/8" X 3" (73mm X 75mm)
(skirt inkstamp) MADE IN JAPAN
Picture courtesy Craig Polkinghorne |
2 7/8" X 3" (72mm X 77mm)
(skirt inkstamp)
Picture courtesy Craig Polkinghorne |
2 7/8" X 3" (72mm X 77mm)
(skirt inkstamp) MADE IN JAPAN
Picture courtesy Craig Polkinghorne |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.