Koto middle of Muromachi period (Mei'ou era/1491-) Owari Length of cutting edge 24.9cm Inward curvature Width of base 22.8mm Thickness of base 6.5mm
NBTHK(Tokubetsu Hozon) certificate
Under Negotiation
Shinto Momoyama period (Tensho 20th - Kan'ei 8th/1592-1631) OwariLength of Cutting edge 30.8cm Curcature 0.2cm Width of Base 28.9mm Thickness of Base 5.6mm
NBTHK(Hozon) certificate
Shin-shin-to end of Edo period (Kaei 7th/1854) Mikawa Length of cutting edge 29.8cm Curvature 0.1cm Width of base 28..5mm Thickness of base 8.4mm
Koto end Muromachi period (Eiroku 12th/1569) Houki Length of cutting edge 25.1cm Curvature 0.1cm Width of base 24.2mm Thickness of base 6.0mm
with)Black Stone-surface Ishimeji scabbard Aikuchi style Koshirae