Mark with Japanese mark: 菊川久英入道南甫 "Kikukawa | #433273

菊川久英入道南甫 "Kikukawa Hisahide nyudou Nanpo". This mark comes from a "kozuka", the hilt of a secondary knife that is often paired with a Japanese sword, and was designed by Nanpo. Nanpo worked as a "soukenkinkou" in the Nara line of the Kikukawa house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.