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
NBTHK(Hozon) certificate
Shin-shin-to latter half of Edo period (Bunsei 4th/1821) Bushu/Owari/Mikawa Length of cutting edge 27.4cm No curvature Width of base 27.7mm Thickness of base 7.7mm
Kamakura period (about 800 years ago) YamatoLength of cutting edge20.3cm No curve Width of Base16.7mm Thickness of base5.2mm Whole length29.7mmEntire length of fitting Koshirae : 37cm
with)Vermillion Urumi-nuri lacquered scabbard Dragon Aikuchi fitting
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