Mark with Japanese mark: 雙龍軒 "Souryuuken" | #433551

雙龍軒 "Souryuuken". 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.