Here are two pieces that I have had in my collection for a few years now. The blue NN Pittsburg is really neat seeing as the glaze in the wire groove is darker than the rest of the piece. The other signal has the most interesting glaze I've seen on porcelain. In a certain light it looks almost purple and the piece just glows with the multi-colored specks in the glaze! See the next picture for a good close-up. Has anyone ever seen anything like this before?

UPDATE:

Sorry for the blurry pic... Elton has informed me that the blue piece is not a Pittsburg but might possibly be a New Lexington piece.

Thanks again Elton!