|
2 1/2" X 4 1/8" (61mm X 101mm)
(dome top) G.P.O
Picture courtesy Bob Berry |
U-1578: England
|
2 1/2" X 4 1/8" (61mm X 101mm)
(dome top) G.P.O
Picture courtesy Bob Berry |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.
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