The first commercial Hi Powers to have a factory parkerized finish was the MkII. It was a model intended to be specifically marketed to police and military. The metal finish was purposely less attractive because FN wanted to compete with the competition on price. Finely polished metal before bluing costs $.
Since it didn't have the polished blue of the commercial models it wasn't a booming success, even to police and military. It also appeared at about the same time as Glock (early '80's).....whose sales far eclipsed the HP and other steel/aluminum framed pistols and virtually killed off revolvers in law enforcement.
No FN/Browning Hi Power has ever been available in stainless steel. You may find the occasional MkII in epoxy finish, but none in polished blue.
The FN epoxy finish is pretty darn good btw.