AS21538 Katana: Mumei (Sa Sadayoshi)

Katana in Shirasaya(NBTHK Tokubetsu Hozon Token)
Signature: Mumei (Sa Sadayoshi)
無銘(左貞吉)

(We divide 4 sections for each sword as Saijyo saku, Jyo-jyo saku Jyo saku and regular
saku)
This sword belongs to Jyo Jyo Saku ranking.
The blade was polished.
Habaki : Gold foiled double habaki.
Blade length : 76.0 cm or 29.9 inches.
Sori : 1.5 cm or 0.59 inches.
Mekugi : 2
Width at the hamachi : 3.22 cm or 1.26 inches.
Width at the Kissaki : 2.26 cm or 0.88 inches.
Kasane : 0.73cm or 0.28 inches.
The weight of the sword 850 grams.
Era : Nanbokucho period.
Shape : O-Suriage Mumei sword. Wide and thick, Sori is regular and Kissaki is longer.
Bo-hi is engraved on bothside.
Jigane : Itame-Hada well grained, Jinie attached, pare Utsuri is engraved.
Hamon : Ko-Niedeki Suguha. Sunagashi and Kinsuji worked.
Boshi: Midare-Komi sharp round shape.

Special feature: Sa Sadayoshi is O-Sa’s student. He is worked at Kyushu
province but his style is different at all from other sword smith. His
sword’s Jigane and Hamon are very clear and, Chikei and Kinsuji
mixed. There are many Sa school sword smith like Yasuyoshi(Son
of O-sa), Yukihiro, Sadayoshi, Kunihiro, Hiroyuki, Hiroyasu,
Yasuyuki. All of them made sword same as their master.
The students of the students are called Sue-Sa.

From Aoi Art: This sword is O-Suriage Mumei but wide and Kissaki is large
size, typically Nanbokucho sword’s shape and Sa school Boshi.
The sword is 850 grams and also 76cm, we strongly recommend
this huge sword.

NBTHK Tokubetsu Hozon Token
Aoi Art estimation paper: whole Oshigata.