AS25382 Katana: Kyushu Higo Dōtanuki Kōzuke no Suke (NBTHK Tokubetsu Hozon Token)

Katana in Shirasaya with Koshirae (NBTHK Tokubetsu Hozon Token)
Signature:
Kyushu Higo Dōtanuki Kōzuke no Suke
九州肥後同田貫上野介

We divide 4 sections for each sword as Saijyo Saku, Jyojyo Saku, Jyo Saku and Regular Saku.
This piece is ranked as Jyojyo Saku among works by Kyushu Higo Dōtanuki Kōzuke no Suke.

Habaki: Silver single habaki
Blade Length: 68.0 cm (26.8 in)
Curvature: 1.4 cm (0.6 in)
Mekugi-ana: 2 holes
Motohaba (Width at Base): 3.3 cm (1.3 in)
Sakihaba (Width at Tip): 2.4 cm (0.9 in)
Kasane (Thickness): 0.5 cm (0.2 in)
Sword Weight: 755 grams
Era: Azuchi-Momoyama period, around 1600

Shape: the wide blade with small curvature and long kissaki, the typical shape from Keicho period.
Jigane: intense Itame pattern with jinie.
Hamon: Nie base Suguha with Ashi. Boshi is midarekomi.

Features:
The Dōtanuki were a school of swordsmiths active in Kikuchi, Kumamoto. They flourished under the patronage of Katō Kiyomasa but are said to have ceased their craft with the decline of the Katō family.
They are known for a style that emphasizes practicality and rugged strength—qualities favored by Kiyomasa himself.

Koshirae: Japanese Army mount

NBTHK Tokubetsu Hozon　Certificate
Aoi Art estimation paper: Whole Oshigata