Hi!
This is 'YOSHIHISA', a brand name of knives for professional.
http://imge.dena.ne.jp/exe5/cb/12/81...04644859_1.jpg
The company name is 二唐刃物鍛造所/Nigara hamono tanzo-jyo(Nigara knife forging company). See below link.
http://www.t-ironworks.jp/article/nigara/index.html