AS10433-Katana: Mumei (Ko Uda)

Katana in Shirasaya with Koshirae(NBTHK Tokubetsu Hozon Paper)
Signature : Mumei (Ko Uda)
無銘（古宇多）

(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku
Jyo saku and regular saku)
This blade belongs to Jyojyo saku ranking.
The blade was polished.
Hanaki: Gold foiled single Habaki.
Blade length: 70.3 cm or 27.67 inches.
Sori : 1.4 cm or 0.55 inches.
Mekugi : 3
Width at the hamachi: 2.67 cm or 1.05 inches.
Width at the Kissaki: 1.96 cm or 0.77 inches.
Kasane : 0.53 cm or 0.20 inches.
Era : Late Kamakura period.
Shape : O-suriage Mumei. Regular width and thickness.
Jigane: Itame-Hada and Masame-Hada mixed. Jinie attached, there is Chikei, able to see Hadame well.
Shinogi-ji: Itame-Hada and Masame-Hada mixed.Kamakura feeling.
Hamon: Niedeki Suguha Hamon with deep Nie.
Sunagashi, Kinsuji, Ashi, Yo worked.

Special feature: Ko-Uda is said to moved from Yamato to Ecchu around end
of the Kamakura period. Ancestor is Nyudo Kunimitsu,
active around the Nanbokucho period to the Muromachi period. Uda
sword which was made from end of Kamakura period to
Nanbokucho period is called Ko-Uda, style is Yamato with
strong Nie, also some sword is Soshuden style. Jigane o

Koshirae :
Tsuba:　square shape coper Tsuba.
Fuchikashira: Copper, arabesque pattern is engraved.
Saya : Black Roiro Saya.
Menuki: Shakudo, the arrow is engraved with gold and silver color.

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