Hi,
Gil is generally considered to be the first maker to offer 440C steel in custom knives, I'll let someone else explain, if you want.
The Kenpo Karate knife is by United Cutlery and is made of 420 stainless steel, it is not a very good steel in my opinion, but they are pretty.
The knife made by Gil is the Parker Knife, named in honor of Col. Parker, who was Elvis' manager, and a teacher of Parker Kenpo Karate, which Gil studied, and has a black belt in. Gil also made one for Elvis.
The one that I ordered from him a few years ago was custom with stainless steel fittings, and burgundy micarta scales. It is a hidden tang knife. I think I paid $650, but that was with the stainless furniture, it is usually brass.
Cheers,
Steven Garsson