U-2215: Canada
3 1/4" X 3 3/8" (81mm X 86mm)
(top embossed)
Dry process. Picture courtesy Barrett Nicpon |
3 1/4" X 3 3/8" (81mm X 86mm)
No markings
Picture courtesy Barrett Nicpon |
3 1/2" X 3 3/8" (89mm X 87mm)
No markings
Picture courtesy Barrett Nicpon |
3 1/2" X 3 3/8" (89mm X 87mm)
(skirt ink stamp) {maker ubknown}
Picture courtesy Barrett Nicpon |
3 1/2" X 3 3/8" (89mm X 87mm)
No markings
Picture courtesy Barrett Nicpon |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.