U-1929A: England
3 3/8" X 4 1/4" (83mm X 104mm)
(front skirt) B.I.H.C. {British Insulated & Helsby Cables}
Picture courtesy Bob Berry |
3 1/2" X 3 7/8" (83mm X 98mm)
(front skirt) {Bullers}
Picture courtesy Bob Scafe |
This is a dryspot style where the inner skirt unscrews to allow a wire to pass through. U number assignment from Worldwide Porcelain Insulators 1986 Supplement by Marilyn Albers & Jack Tod.