What insulator is it?

By Chris McClelland; posted April 25, 2006

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I have never seen one of these before but I am certain it is not the bottom of a multi part. As seen the top is completely smooth without glaze and no roughness, chips, or anything where a top would have been if it were a multi or susp insulator. Somewhat threaded pinhole and has 2 other inner petticoats. What U # is this and what is the commonality of these?

150571323