I kind of am confused here. You have the pitch and diameter, that's about all the info on a prop you need. It could be an oddball size for that engine and not many were sold which is why it's rare today.
By what? Compared to a 13" pitch? Unless the blades are a special design like a high thrust. Not worth the time. Probably why it only lived one yr in the parts book. Look how many props are out there with a .5" pitch increment.
