[ Feature ]
Form : Ryo-shinogi-zukuri. Kera-kubi cross-section is octagom, its length is short. Mihaba is relatively wide. It draws an undulating line for both side.
Nakago : Ubu. Yasurimes are suji-kais. Saki is kiri. One hole.
Engraving : on front omote side, there is su-ken shape line with round stop.
Jigane : Itame-hada with some changes. Jijie attached. Chikei appeared.
Hamon : Sugu-ha tone. Ko-gunomes mixed. Nie attached well.
Boushi : It runs in sugu form. It has no turned part, becoming yakitsume form.

[ Highlight ]The spear has a well-defined form, with well-grained jigane base, a finely forged surface and a straight, nie blade with a small alternating grain ko-gunome pattern. The sword-shaped guttering, which corresponds to the shape of the spear, is also a highlight. Sadakuni was a swordsmith of the Shimada school. Sunpu Anzai is located in present-day Anzai, Aoi-ku, Shizuoka City, close to Sunpu Castle, and Yasutsugu, Shigekuni and others are said to have created swords in this base.

[ Conditions ] The chisel pillow does not stand up very well, possibly due to the removal of rust from the stem in later years, and there are fine lines that appear to have been rasped vertically. Otherwise, the condition is excellent.