Sugimoto's usuba knife, featuring a traditional design and exceptional sharpness. - Blade Shape: Usuba (thin blade) - Engraving: Tokyo Sugimoto - Accessories: Cover Thank you for viewing. This is a Sugimoto usuba knife, suitable for professional chefs and cooking enthusiasts alike. I am also a chef, but I've moved away from Japanese cuisine, so I no longer have the opportunity to use it. This is a very fine example of honkasumi steel. I have kept it in storage, and because it is carbon steel, I have maintained it with cream cleanser when rust appeared. According to Sugimoto's website, the 24cm honkasumi version costs 110,000 yen. This is an older model, and the current models do not have the Sugimoto mark below.