I have one of those fighters that you have pictured, third one down. Designed by Michael Enchanis, who was a big muckity-muck in knife fighting, back in the day.
He wrote several books on knife fighting. His design was made commercially by Al Mar as the Warrior, and by another firm, who called it the hobbit warrior.
Good design, shockingly light and quick in the hand. I am glad I managed to score one.