U-1784: Russia
2 3/8" X 3 1/2" (58mm X 86mm)
No markings
Picture courtesy Bill Ostrander |
2 1/4" X 3 1/8" (55mm X 78mm)
(front crown inkstamp) Т-ва М.С.К. {Matthew Sidorovich Kuznetsov}
Picture courtesy George Sukhoff |
2 1/4" X 3 1/8" (55mm X 78mm)
(ear ink stamp)
Picture courtesy Bob Berry |
2 1/4" X 3 1/8" (55mm X 78mm)
(ear incuse)
Picture courtesy Bob Berry |
2 1/4" X 3 1/4" (56mm X 83mm)
(ear incuse)
Picture courtesy Bob Berry |
2 3/8" X 3" (59mm X 76mm)
No markings
Picture courtesy Bob Berry |
U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod. Note that this has holes in the ears for a tie wire.