Mark with Japanese Mark: 文政三庚辰春　三所七所物彫之 "Bunsan | #458001

文政三庚辰春　三所七所物彫之 "Bunsan kanoetatsu haru mitokoro nanatokoromono korewo horu". This mark is from a tsuba and was made by Tsunetoshi, 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 tsuba is a sword guard designed to protect the hand from contact with the blade. It also balances the weight of the sword.