U-2916: England
5" X 4 5/8" (127mm X 117mm)
(dome side) MADE IN ENGLAND {Bullers}
Picture courtesy Fredrik Höjefält |
Note this is a two part insulator with the base being an oil cup designed to increase the insulation value when filled with insulating oil.
U number assignment from Worldwide Porcelain Insulators 1986 Supplement by Marilyn Albers & Jack Tod.