Mark with Japanese mark: 一家正脈 "Ikkaseimyaku" | #433134

一家正脈 "Ikkaseimyaku". This mark comes from a "tsuba", a sword guard designed to protect the hand from contact with the blade and an opposing sword. It was made by Seiju, who worked as a "soukenkinkou" in the Nara line of the Kawano house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.