Mark with Japanese mark: 関 "Seki" | #433548

関 "Seki". 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 Yoshinori, who worked as a "soukenkinkou" in the Nara line of the Seki house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.