In general, Ken, I use TCDb a lot to identify cards, and it's a great site imho. Recently I notified them of a variation that they didn't have listed, and they said they don't list those types of errors/variations. One kind was a color variation; another was genuinely an error in my book, but not theirs. You could run it by them, even send them a photo. To me, you have a real keeper there.
Happy trading all - Rol