Unknown Porcelain Block-Type Insulator (Not telegraph!!)

By Zac Mirecki; posted December 29, 2007

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This is a piece that I picked up about 4 years ago when I first started collecting insulators seriously. I was told that it was most likely used on the trolley or transit system, but am not 100% sure. It is embossed 5401 on both sides and is not marked otherwise. Has anyone seen anything like this before?

Thanks for taking time to look!

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