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Comment by Steven Matthew on February 17, 2013 at 21:59

It looks like a b to me. All I know is they were made in Japan. Up to the 80s. But I'm not really sure.

Comment by peter force on February 17, 2013 at 21:56

hey steve...id like to learn more about this piece if you wouldnt mind.do you already know? if not i cant totally read the PATNT number... dos it start with a B...which does happen.... anyway the patent can be anything from the color of the bone...to the ltch system...bot most of al it will help me date it the knife to a crtain degree. i already tried some guessing..but with no luck... the nuimber would be great. it looks like b87330... the B means "re-examined patent" ...thanx for helping me out!!!~pf~