Thank you all for your answers
Here are some more infos and pictures :
Habaki: Kin kise single habaki.
The blade was polished.
Blade length :70.1 cm or 27.6 inches.
Sori : 2.0cm or 0,79 inches.
Mekugi : 2
Width at the hamachi : 3.08cm or 1.213 inches.
Width at the Kissaki : 2,08cm or 0,82 inches.
Kasane : 0.6 cm or 0.24inches.
The weight of the sword is 670 grams
Era : Nanbokucho period: 1362.
Shap Taihai: O-suriage Mumei style is a work with a wide body, layered thickness, deep curvature, and a dignified appearance with a long tip.
Jigane :Koitame hada It becomes a fine ground iron that is well kneaded and packed.
Hamon :From Niedeki ,nioikuchi deep Gunome midare Hamachi to yokote.
About the Koshirae :
NBTHK Tokubetsu Hozon Tosogu
Saya :black roiro The pod is carved with leaves and painted with brown lacquer.
Tsuba : Signature: Yoshinori. On the Otafuku-shaped iron Tsuba, Kiri and phoenix are engraved and painted with gold.The other side is bare copper.
Fuchikashira: Kiku flower pattern is engraved on the Syakudo nanako plate, and the color painting is applied.
Menuki : Shakudo, farm was carved and painted with gold.