Mark with Japanese Mark: 水戸住　玉川美久作 "Mito ju | #458312

水戸住　玉川美久作 "Mito ju Tamakawa Yoshihisa saku". This mark is from a kozuka, which is the hilt of a small, secondary knife. It was made by Yoshihisa, who worked as a sword engraver (soukenkinkou) in Hitachi Province (present-day Ibaraki Prefecture) for the Tamakawa house. Soukenkinkou is the Japanese name for metalworkers who design accessories for bladed weapons.