Mark with Japanese Mark: 赤城軒元孚　行年七十五 "Sekijoken | #458214

赤城軒元孚　行年七十五 "Sekijoken Motozane gyounen nanagosan". This mark is from a kozuka, which is the hilt of a small, secondary knife. It was made by Motozane, 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.