U-1647: Spain
2 1/4" X 3 1/4" (55mm X 80mm)
(dome incuse) (dome inksamp) 10
Picture courtesy Bob Berry |
2 3/8" X 3 1/4" (58mm X 80mm)
No markings
Picture courtesy Bob Berry |
2 3/8" X 3 1/4" (58mm X 80mm)
No markings
Picture courtesy Bill Ostrander |
U number assignment from Worldwide Porcelain Insulators 1986 Supplement by Marilyn Albers & Jack Tod.