Mark with Japanese mark: 馬面序政 "Bamen Tsunemasa" | #433522

馬面序政 "Bamen Tsunemasa". 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 Tsunemasa, who worked as a "soukenkinkou" in the Nara line of the Bamen house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.