I see "heat treated by bos" on many knife selling sites. I see this on upper price range knives as well as mid range priced. He must be very good. But on his website "their" website Tony and Reese Bose, he shows his Rockwell hardness tester. So just a guess he may do some of his own. But I am with the guy that said send them out. For these people, like Bos, this is all he does "I am assuming that is his main business" so he does it best. Paul Bos must be one of the best. I have see the Bos name on many of the better knife selling websites specifically mentioning at the end "treated by Bos"

Daniel