Mark with Japanese mark: 竜翁 "Ryuou" | #433108

竜翁 "Ryuou". This mark comes from a "fuchi", a sword ferrule in the shape of a cap or ring, and was made by Seiju. Seiju worked as a "soukenkinkou" in the Nara line of the Kawano house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.