sep 16 1915 Porcelain Insulator U number and possible value?

By Richard Case; posted February 6, 2023

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Any help here on this, stamped on top of white bare area near cable groove... It got broken and I'm going to sell it as a kit sul lat tor..Wonder what I should ask for it as it may be a good piece.. About 7 3/4" dia x 6 1/4 " tall ..........thanks