Mark with Japanese mark: 白山子　光長 "Hakusanko | #433358

白山子　光長 "Hakusanko Mitsunaga". This mark comes from a "menuki", decorative ornaments that are found in the binding of a sword and used to help with grip. It was designed by Mitsunaga, who worked as a "soukenkinkou" in the Nara line of the Toyokawa house. Soukenkinkou is the Japanese name for the makers of the accessories for bladed weapons.