This is either a great treasure or a great fraud. The stamp is genuine, but I don't know about the cancel. I found this one in Skinner-Eno. It is LC-NP 15 (or LC-NP 15a - worn state or somewhere in between, if genuine).
One of the members of our club claimed it was fake, but he tends to see fakes in everything and every stamp has been reperfed... He could be right on this, but I wanted some other opinions before I spend the money to get this certified.
So, folks, please feel free to weight in on this one. As always, your opinions are solicited and any information - either for or against - is greatly appreciated.
The first scan is the color stamp, with no modifications other than having cropped the black background. The second image has the color removed and light/clarity adjusted to bring out the cancel as much as possible.