Mark with Japanese mark: 武江赤　正虎 "Bukou aka | #433480

武江赤　正虎 "Bukou aka Masatora". 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 Masatora, who worked as a "soukenkinkou" in the Nara line of the Suangawa house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.