Mark with Japanese mark: 渋谷一信 "Shibuya Kazunobu" | #433270

渋谷一信 "Shibuya Kazunobu". This mark comes from a "tsuba", a sword guard designed to protect the hand from contact with the blade and an opposing sword. It was made by Kazunobu, who worked as a "soukenkinkou" in the Nara line of the Shibuya house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.