Mark with Japanese mark: 清寿工 "Seiju kou" | #433107

清寿工 "Seiju kou". 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 Seiju, 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.