The circle indicates the time we are discussing in this section
During the Nanboku-Cho Period, the type of Tanto called Hirazukuri-Kowakizashi-Sunnobi-Tanto was made. Hirazukuri means a flat sword without the Yokote line and without Shinogi. Ko-Wakizashi means a shorter sword. Sun-Nobi Tanto means longer than standard. This is also called Enbun Jyoji Kowakizashi Tanto. It is called this way because the majority of this type Tanto was forged around Enbun, Jyoji Imperial era. In Japan, each time the Emperor changed, we changed the names of the era. Enbun was from 1356 to 1361, Jyoji was from 1362 to 1368
Shape (Sugata 姿) ——-It is common idea that the length of Tanto should be 1 shaku or less. Shaku is an old Japanese measurement unit, which is very close to 1 foot. 8.5 sun (old Japanese measurement unit) is approximately 10 inches. This is the standard length Tanto called Jo-Sun Tanto. Anything longer than Jo-Sun Tanto is called Sun-Nobi Tanto. Anything shorter than Jo-Sun is called Sun-Zumari Tanto. Most of the Nanboku-Cho Tanto is approximately 1 foot 2 inches long, therefore they are called Hirazukuri-Kowakizashi-Sun-Nobi Tanto . Sakizori (curved outward at the top. See the illustration above). Wide width and thin body. Fukura Kareru (No Fukura). Shin-no-Mune. See the illustration below.
Hi, Horimono (Goove and engraving 樋, 彫刻) —– Groove on Mune side. Bonji (Sanscrit, described in 17 Bonji Suken), Koshi-bi (Short groove) and Tokko- Tsuki Ken, or Tumetuki Ken (see below) appears. Curving of Ken (dagger) is done wide and deep in the upper part, the lower part was curved shallow and narrower. This is called Soshu-Bori (Soshu carving).
Hamon (Tempered line) —– Narrow tempered area at the lower part, gradually grows wider as it goes up toward the top then similar look wide Hamon goes into the Boshi area. Hamon in Kissaki area is Kaeri Fukashi (turn back deep) as the illustration below. Coarse Nie. O-Midare (large irregular pattern).
Jihada —– Loose wood grain pattern called Itame. Yubashiri (discussed in 17 Yubashiri, Chikei.jpg), Tobiyaki (Irregular patches of tempered metal) appears. Crowded Tobiyaki is called Hitatsura (illustration above).
Nakago (Tang) —- Short Tanago-bara. That means the belly of Japanese bitterling(fish) shape.
Sword-smiths during Nanboku-Cho Period Soshu Den(school)
Soshu Den ———————————————————-Hiromitu( 広光) Akihiro (秋広) Yamashiro Den ————————————————–Hasebe Kunishige (長谷部国重) Bizen Den ——————————————————— Kanemitu (兼光) Chogi (長義 )