I'm not too particular about brand names, but since it has the Chiyozuru mark, I decided to look into it. It seems he was famous as a maker of sharp tools. The anecdotes are also interesting, so I recommend you read them. https://www.misyuku-suzuki-kanamonoten.com/toukyoukannakajinotatujin1.html https://www.misyuku-suzuki-kanamonoten.com/toukyoukannakajinotatujin3.html https://www.mokuzai-tonya.jp/geppou/2505/pdf/2505_04.pdf Reading them makes me want to try it myself. The blade sharpening is uneven, so let's fix it while sharpening. I've cleaned off the dirt, but it's an old base, so it's not prone to warping. Please refrain from price negotiations except for bulk purchases. Also, please consult with us in advance for bulk purchases.