Mark with Japanese mark: 竜眼子壽良 "Ryuganshi | #433143

竜眼子壽良 "Ryuganshi Hisayoshi". This mark comes from a "menuki", decorative ornaments that are found in the binding of a sword and used to help with grip. It was designed by Hisayoshi, who worked as a "soukenkinkou" in the Nara line of the Tsuchiya house. Soukenkinkou is the Japanese name for the makers of the accessories for bladed weapons.