|
4 1/8" X 5 1/4" (105mm X 130mm)
No markings
Picture courtesy Tris Horton |
U-1981B: United Kingdom
|
4 1/8" X 5 1/4" (105mm X 130mm)
No markings
Picture courtesy Tris Horton |
U number assignment from Worldwide Porcelain Insulators 1986 Supplement by Marilyn Albers & Jack Tod.
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