This is a detailed part of chapter 20. Please read 20 | Nanboku-Cho Tanto（南北朝短刀) first, before reading this chapter.
The characteristic of the picture above, the shape is emphasized in the drawing.
At the end of chapter 20 | Nanboku-Cho Tanto（南北朝短刀, there is a list of swordsmith’s names. Hiromitsu and Akihiro represent the most common characteristic of Nanboku-Cho Tanto.
Hiromitsu From Sano Museum Catalogue (permission granted)
Enbun Jyoji Ko-wakizashi Tanto is also called Sun-Nobi Tanto. The top part of the Tanto bends outward slightly, this is called Sakizori.
Hiromitu and Akihiro Characteristic
Shape———-wide width. Usually 1 foot and 1, 2 inches long. Thin body. Sakizori
Hamon ——-Tempered line can be wide and narrow. Yakidashi (1, 2 inches above a Machi area) is narrowly tempered and wider tempered line above. Hamon around Fukura area is showy. Mainly Nie. Sunagashi, Kinsuji, Gunome, Umanoha-Midare (shape like horse teeth), Hitatsura appears (see above drawing).
Boshi———-Irregular, uneven temper line, the almost entire area. Deep turn back.
Jihada ———Wood grained
Nakago ——-Tanago-Bara shape (refer 20 | Nanboku-Cho Tanto（南北朝短刀).
The first generation Shodai Nobukuni is the top three students of Sadamune. He is called Sadamune San Tetsu (貞宗三哲). The characteristic of Nobukuni is almost the same as the characteristic of Hiromitsu and Akihiro. Nobukuni also created Sun-nobi Tanto like the one below which has a Hoso-suguha (narrow straight tempered line), Ko-Mokume (fine small burl), Ko-maru Boshi (small round)
This is my sword. Shodai Nobukuni (初代信國). This is Juyo Token
number Juyo 3220, Certification Juyo-Token
Wakizashi Nobukuni, 31.4cm length, 0.3cm curvature, Hirazukuri, Mitsumune (three-sided Mune ), Sunnobi, Ji-hada is Wood grain and Jinie (Nie on the surface), Hamon is Chu-Suguha ( medium straight), Front carving shows Bonji (Sanscrit), Sanko-Ken. The back side of the sword, engraving is Sanscrit and Hoko (pike). Original Nakago. The examination by the Nihon Bijutu Token Hozon Kyokai. It is certified as Juyo-Token. The Chairman Moritatu Hosokawa