My friend had this one made in 1966-67 in Seattle, Washington. You're right about the martial arts. The man in question is a kung fu master, and trained in China in the 60s, 70s, and 80s.
I'm looking to get some custom leather for this one, as the nylon it came to me in is ill-fitting, and not designed for this knife. (mostly just to keep the blade from cutting things up during shipping)
Steve