After the live experience of the war of Jokyu-no-ran, people started to move toward sturdier, grander, wider swords. The swords made around this time is called Ikubi Kissaki (猪首切先). Ikubi means wild boar. Ikubi Kissaki style sword has a style of stout look like a wild boar. This is the era of the height of sword making. Many top swords smiths created wonderful swords during this time. It is said that there is no mediocre sword among Ikubi Kissai.
SUGATA(shape) —— Originally 3 feet or longer, therefore it is often shortened at the later time. Wide width, thick Kasane (thick body) with Hamaguri-ha (蛤刃). Hamaguri-ha means the thickness is shaped like a clam. The width at the top and at the bottom is not much difference. Shinogi (鎬)is high, and shinogi width is narrow. Illustration of Cross section below.
KISSAKI —— Ikubi kissaki. Ikubi means wild boar neck. Wild boar looks like no neck, stout look shape. Short Kissakii but wide at the yokote line. The illustration below is exaggerated a little to show the idea.
Hamon (刃文) —— Kawazuko-choji(tadpole head shape). O- choji(clove like shape) and Ko-choji mixed. Irregular waviness mixed with choji and straight, this is called suguha-choji.
Kawazuko-choji O-choji Ko-choji Suguha-choji (tadpole head) (large clove) (small clove) (straight and clove)
Boshi(鋩子) ——— Yakizume as below. Nagamitu(長光), Kagemitu( 景光), Sanenaga(真長) created Boshi called Sansaku Boshi(三作鋩子). Illustration below.
Yakizume Sansaku-Boshi 
Ikubi Kissaki Sword Smiths
Fukuoka Ichimonji Group (福岡一文字) ——— Fukuoka Ichimonji Norimune (則宗)Kamakura Ichimonji Group(鎌倉一文字) ———- Kamakura Ichimonji Sukezane (助真)Soshu Bizen Kunimune Group(相州備前国宗)—- Soshu Bizen Kunimune (国宗)Bizen Osafune Group(長船)——————Bizen Osafune Mitutada(長船光忠) Nagamitsu(長光) Ugai Group—————————————————– Ugai Unji (鵜飼雲次)
Sano Museum Catalogue (permitted) Osafune Nagamitsu(長船長光 )
Osafune Mitsutada(長船光忠) Osafune Mitsutada(長船光忠) *was family sword
