The blade was polished.
Blade length : 34.0 cm or 13.38 inches.
Sori : 0.6 cm or 0.23 inches.
Mekugi : 0
Width at the hamachi : 2.99 cm or 1.17 inches.
Kasane : 0.77 cm or 0.30 inches.
Era : Late Edo period.
Shape : The blade is wide and thick with small sori nice looking shape.
Jitetsu : Koitame had well grained with jinie attach mug style texture.
Hamon : From the Hamachi, nioideki suguha and then Choji midair
and Juka choji midair mixed.
In Ha, ash which is very soft feeling and round shape Boshi.
Special feature : At the NBTHK, judged as Yokoyama Suketada but I think If the suketada, The Hamon is more simple.
So I think the blade looks like Yokoyama Sukekane first generation because the Hamon is very active without faults Juka Choji midair which is typical nice Sukekane.
Even though the blade is unsigned Ubu naaakago,
the blade is very nice Jigane and Hamon.
We recommend this sword for you.
This Tanto's Mekugi ana(hole) is nothing so the swordsmith had been
keeping the blade so long without making signature.
NBTHK Hozon Token.
Aoi Art estimation paper : whole Oshigata.