Mark with Japanese mark: 武州玉川住　駒井延常 "Bushu | #433579

武州玉川住　駒井延常 "Bushu Tamagawa ju Komai Nobutsune". 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 Nobutsune, who worked as a "soukenkinkou". Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.