Japanese Knife, Yasuda Hamono, Gyutou, Seki Kotetsu Series, Black HandleYasuda Hamono is a family owned company in Seki City, Japan that produces quality knives. They focus on the research and development of the knives' heat treatment and sharpening in order to provide a durable selection. The city of Seki is world famous in production of the finest knives. The history of these knives are rooted in weapon production in Seki dating back to the 13th century, when the famous samurai swords began to be made here. Approx.