The NTHK (Nihon Token Hozon Kai) or group for the preservation and study of the Japanese sword is a group dedicated to the study and understanding of Japanese swords and sword fittings in Japan.

There are 2 official main branches outside of Japan, one is in Los Angeles (West Coast branch) and the other is in New York (East Coast branch). The Los Angeles group has a meeting every 4th Friday for its members, and in conjunction with the Nanka Token Kai, holds one of the largest Japanese sword displays for the public every year at the Nisei week celebration. This display is free for the public.

Study at the Los Angeles branch is held Japanese style with a "Kantei" or sword identification challenge with a lecture afterwards about the swords used. All items used for the lecture are certified as genuine by either the NBTHK or NTHK.

As members of the branch, we are also invited also to attend the study group meetings held in Japan at the Home branch in Tokyo. This helps to increase our appreciation and help expand our knowledge about Japanese swords as well as their history.