AS21273-Katana:Not clear (Bisyu Osafune Ie??)

Katana in Shirasaya(NBTHK Hozon Token)
Signature: not clear signature(Bisyu Osafune Ie?)
Eitoku ?
銘不明(備長船家□)

Sayagaki: Bizen Norimitsu. Ubu-Mumei.
Blade length is 2 Shaku 2 Sun 1Bu.
In early September 1991
Unknown author

(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 : silver single habaki.
Blade length: 67.2 cm or 26.45 inches.
Sori : 1.55 cm or 0.61 inches.
Mekugi: 2
Width at the hamachi: 2.785 cm or 1.09 inches.
Width at the Kissaki: 1.86cm or 0.73 inches.
Kasane :0.6cm or 0.23 inches.
The weight of the sword 510 grams.
Era : Nan okuchi period 1381.
Shape: Ubu Nakano original style regular width, thickness with deep sori　and longer kissaki.
Jigane: Koitame hada and komokume hada mixed with jinie attach
at front part, Masame style jigane and utsuri appear.
Hamon :Konie deki Choji midare and gnome midare mixed with
from the monouchi area, active cyoji midare work with sunagawa,
kinsuji work. bo-shi is midarekomi hakikate yakizume style.

Special feature: Bisyu Osafune Moriie is usually monotonous Gunome Choji Midare
Hamon. The first was said to be Haakeda school, but probably Kozori school

From Aoi Art: This work is a work of Eitoku Nenki, and although there are some loose parts in Jigane, fine Mokume hada and Koitame hada are mixed.
Utsuri will appear. Iemori has many works that have decayed due to
the small inscription, and this work is also true. At the Japanese
Sword Museum
The part of the inscription was identified, and here the work of
The Nanbokucyo period of Bizen Osafune Moriie was revived.
When the Muromachi period goes down from the generation of
Nanbokucyo era, there are many monotonous Gunome Midare works,
and hamon near Monouchi cannot be seen like this work. The bright
hamon has some flaws, but I would definitely recommend it as a work
of the Nanbokucho period.

NBTHK Hozon Token
Aoi Art estimation paper: whole Oshigata.