3 1/4" X 3 3/4" (82mm X 95mm)
(skirt ink stamp) MADE IN JAPAN
Picture courtesy Bob Berry |
3 1/4" X 3 1/2" (83mm X 88mm)
(skirt ink stamp) JAPAN {NGK}
Picture courtesy Bob Berry |
U-2221: Japan
3 1/4" X 3 3/4" (82mm X 95mm)
(skirt ink stamp) MADE IN JAPAN
Picture courtesy Bob Berry |
3 1/4" X 3 1/2" (83mm X 88mm)
(skirt ink stamp) JAPAN {NGK}
Picture courtesy Bob Berry |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.
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