Mark with Japanese Mark: 仙台住　清定 "Sendai ju | #457987

仙台住　清定 "Sendai ju Kiyosada". This mark is from a fuchi and was made by Kiyosada, who worked as a sword engraver (soukenkinkou) in Mutsu Province (present-day Fukushima 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.