Mark with Japanese mark: 仁藤齊　野村正秀 "Jintousai | #433307

仁藤齊　野村正秀 "Jintousai Nomura Masahide". This mark comes from a "kozuka", the hilt of a secondary knife that is often paired with a Japanese sword, and was designed by Masahide. Masahide worked as a "soukenkinkou" in the Nara line of the Nomura house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.