Koto End of Muromachi period (Tenbun 24/1555) BizenLength of cutting edge 22.4cm Inward curvature Width of base 20.7mm Thickness of base 5.9mm
NBTHK(Hozon) certificate
with) Urumi vermilion-lacquered KIRI crest Tsutsu-gane style Aikuchi Koshirae