I have a Nu-type Model B lamp I inherited from my mother--since she collected early Americana and I think purchased it in the late '50s or early '60s, I'm guessing it was from the '30s. It has been electrified (probably in the early '60s or earlier).
It has a ruby red diamond quilted shade. I don't know how old the shade is, it is rough on the bottom edge as if cut, has a vertical seam as if 2 halves were joined together, has a few tiny bubbles in the glass, and has a small bump of glass on one of the top flutes (hand blown?)--my search turned up other colors but not red. I am attaching pictures. There are no chips or cracks.