2 1/2" X 3" (61mm X 77mm)
(dome incuse)
Picture courtesy Bob Berry |
U-1421: England (UK)
2 1/2" X 3" (61mm X 77mm)
(dome incuse)
Picture courtesy Bob Berry |
U number assignment from Worldwide Porcelain Insulators 1986 Supplement by Marilyn Albers & Jack Tod.
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