Mark with Japanese mark: 年在文化六己巳在四 "nenzai Bunka | #433518

年在文化六己巳在四 "nenzai Bunka roku tsuchinoto mi zaiyon". 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.