Koto Middle of Muromachi period (Bunmei 12/1480) BizenLength of cutting edge 25.9cm a bit on inward curve Width of base 23.3mm Thickness of base 9.7mm
Reported/printed in the book of [Nihon Toko Jiten]
Rported in Osafune-cho-shi
NBTHK Tokubetsu Hozon Token) certificate
with) Urumi-nuri blurred red lacquered scabbard AIKUCHI Tanto Koshirae
NBTHK Hozon Tosougu) certificate for Kozuka