4 1/4" X 4 3/8" (107mm X 111mm)
(ink stamp) PINCO {Porcelain Insulator Co.}
Picture courtesy Walt Baumgardt |
U-402A: USA
4 1/4" X 4 3/8" (107mm X 111mm)
(ink stamp) PINCO {Porcelain Insulator Co.}
Picture courtesy Walt Baumgardt |
U number assignment by Jack Tod.
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