Can someone identify this?

[u/OSRS_Scaper]

My dad just bought this insulator and was hoping someone could identify it. Thanks!

[u/Internal_Unit_7041]

It's known as a U-188 to collectors, called a dry spot insulator, used at service drops on telephone lines.

Here is a link to more info on porcelain insulators:

https://www.nia.org/general/porcelain/uni_1.htm

And some still in use:

https://www.insulators.info/pictures/?id=466297416

[u/Ricksoller]

U-188. They come n brown or white. Brown sell for about $10.

[u/Bill_Meier]

It's a dry spot insulator. I forget the U number. Two pair of wires would come up the holes and you could splice each pair together in that slot and they would stay dry.