Of all the blue Pittsburgs I have seen, I think this one fits right in there as the "blue" typically found with these.

What isn't so typical is this insulator itself. It is one of a handful of blue transpositions known that are attributed to Pittsburg manufacture. This is an eBay "find".

I love color! So I thought I'd share a couple pictures of this rarely seen piece as a supplement to the unusually colored glass from my collection.