Koto early Muromachi period (Ouei 18/1411) BizenLength of cutting edge 35.6cm Curvature 0.4cm Width of base 26.7cm Thickness of base 5.9mm
NBTHK(Tokubetsu Hozon) certificate
with)Silver cording HIRUMAKI style Vermillion lacquered scabbard Chi'sa Katana style Koshirae