Mark with Japanese mark: 元治甲子冬　直鏡 "Genji kinoene | #433566

元治甲子冬　直鏡 "Genji kinoene fuyu Naoki". 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 Naoki, who worked as a "soukenkinkou" in the Nara line of the Hata house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.