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2 3/4" X 4" (70mm X 102mm)
No markings
Picture courtesy Lis Bergman |
U-1690: Switzerland
|
2 3/4" X 4" (70mm X 102mm)
No markings
Picture courtesy Lis Bergman |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.
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