Koto on the end of Muromachi period (the latter period of Eisho era/1504 - 20) MinoLength of cutting edge 26.5cm Inward curvature Width of base 22.5mm Thickness of base 5.4mm
NBTHK(Tokubetsu Hozon)carried/reported in 2 issues of Mino-to Oshigata-shuToken-Bijutsu #741
with)Black O-mokume hada Chinkin style gold-inlaid lacquerware scabbard Tanto Koshirae