I had one and foolishly sold it. They are a beautiful knife. Don't remember what steel they used... Schrade also offered a less expensive version of that same knife with a black resin handle.
Did you purchase it new? this add say's they were a suggested retail of 100$ even with some discount that was a pretty expensive factory knife.
I tried to get a better pic of the add that came with the knife, which they apparently all came with. They allude to a special steel, but I don't know if it's add copy hype of just schrade + steel or some other more expensive steel.
And you are right there are Pro Hunter knives PH-1 and PH-2 similar versions of this knife with black handles made with shrade + steel.