Mark with Japanese mark: 渋谷知信 "Shibuya Tomonobu" | #433266

渋谷知信 "Shibuya Tomonobu". 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 Tomonobu, 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.