Mark with Japanese Mark: 雲竜斎　弘泰 "Unryuusai | #458345

雲竜斎　弘泰 "Unryuusai Hiroyasu". This mark is from a fuchi and was made by Hiroyasu, 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. A fuchi is a ferrule that is placed between the tsuba and a sword's hilt.