This is an Aritsugu black-forged deba knife. The blade length is approximately 15.5cm. It is single-edged. The steel is unknown, but it is probably white steel. The handle is brass-wrapped. It has a special engraving. This is an Aritsugu black-forged deba knife. Since the flat surface is black-forged, it was not polished. Polishing would remove the black-forged part, but I think it's better to leave it as is because the surface is uneven. Black forging is an oxide film that prevents red rust, making it easy to maintain, which is preferred by professionals. I think the contrast between the black-forged flat surface and the mirror-finished cutting edge is beautiful. I repaired the rust and scratches, but some fine scratches remain because it was mirror-finished. I recommend it if you don't mind. Both the cutting edge and the back are almost mirror-finished and in good condition. It has been sharpened and polished, so I think it can be used for a long time. It's a convenient size, so I recommend it for both professionals and general households. It has been finished with a Kitayama 8000 grit stone, a Shapton 12000 grit stone, and a natural whetstone. It is in a very sharp condition and can be used immediately. ● Size: Blade length approx. 155mm ● Blade thickness: Approx. 6.4mm at the thickest part of the base of the blade ● Overall length 280mm ● Weight 166g #knife #Aritsugu #deba #15.5cm