Katana in Shirasaya (The 11th NBTHK Juyo Token. (Juyo paper was lost. But this blade has attestation of Juyo Token.)

Signature: Osuriage-Mumei (attibuted as Ko-mihara)

Blade length : 68.16 cm or 26.83 inches.
Sori : 1.5 cm or 0.59 inches.
Mekugi: 2 (1 is open, 1 is filled.)
Width at the hamachi : 3.1 cm or 1.22 inches.
Wide at the Kissaki : 2.54 cm or 1.00 inches.
Kasane : 0.58 cm or 0.22 inches.
Weight of only blade: 610g
Era : Nanbokucho period.
Shape : Osuriage-mumei. The blade is rather wide and thick with Okissaki(very long Kissaki).
On both sides of the blade, Bo-Hi are engraved with Kakito-shi style nakago.
The blade has Mitsumune style.
Jitetsu : Itame hada well grained with jinie attach like Chirimen hada of Aoe school.
Hamon : Nie based Suguha hamon with ashi and Yo scatter in Ha,

Special feature : The blade is very good condition without Kizu and flow.
From the Hamon and Jigane, it kooks like Aoe school.
Sometimes we submit the Ko-mihara blade to NBTHK shinsa after
re polish, the Kantei(judge) is changed to Aoe school.
It means Aoe and Ko-mihara school are very similar.
According to the Juyo paper says that the blade might be Enju school
but attributed as Ko-mihara.
Ko-mihara school started at late Kamakura period and continued to late Muromachi period. We can say the blade which was Kamakura to Nanbokucho period as Ko-mihara.
Masaie and Masahiro are well known sword maker at the first stage of this school.
Anyway this sword is very healthy without kizu and flow.
We recommend to obtain an excellent sword for you.

 

Aoi Art estimation paper : whole Oshigata.
The 11th NBTHK Juyo Token. (Juyo paper was lost. But this blade has
attestation of Juyo Token.)