|
3 1/2" X 3 5/8" (89mm X 91mm)
No markings
Picture courtesy Bob Berry |
U-2390: Unknown
|
3 1/2" X 3 5/8" (89mm X 91mm)
No markings
Picture courtesy Bob Berry |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.
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