Mark with Japanese Mark: 亀雲斎　保国 "Kiunsai | #458383

亀雲斎　保国 "Kiunsai Yasukuni". This mark is from a kozuka, which is the hilt of a small, secondary knife. It was made by Yasukuni, who worked as a sword engraver (soukenkinkou) in Hitachi Province (present-day Ibaraki Prefecture). Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.