Thanks, I looked at the link and also the google images, there is some similarity to a PH but I did not see anything that matched close enough to call it a PH sight. If you have the Old Gunsight book look under the King sight section (in my book page 8) and there is an image very similar to the shaft being discussed here. I don't see any good images of King's sights on Google anywhere.
Of interest is a 1955 lawsuit between King and Micro for patent infringement, if interested.