I posted a review of CRKT's new for 2013 Otanashi noh Ken folding knife. It is a very capable defensive folder by noted designer and martial arts instructor James Williams. At the 2013 SHOT Show, I was able to handle and photograph a prototype Otanashi. It is large, but slim. With a 4.6" tanto blade, it is quite impressive. That, and it conceals very will with a deep concealment clip.
CRKT Otanashi noh Ken Review | BladeBarrelBezel.com