Koto end of Muromachi period (Tensho 4/1576) BizenLength of cutting edge 21.6cm Inward curvature Width of base 21.8mm Thickness of base 5.5mm
NBTHK(HOZON) certificateNTHK(SHOSHIN) certificate
with) Negoro vermilion-lacquered Toppei style scabbard Aikuchi Koshirae
NBTHK(Hozon Tosogu)certificate