Mark with Japanese mark: 江府住　定直 "Koufu ju | #433479

江府住　定直 "Koufu ju Sadanao". 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 Sadanao, who worked as a "soukenkinkou" in the Nara line of the Ido house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.