Mark with Japanese mark: 武江住　正光 "Bukou ju | #433449

武江住　正光 "Bukou ju Masamitsu". 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 Masamitsu, who worked as a "soukenkinkou" in the Nara line of the Ito house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.