Previous answer is
Sadatoshi

Special feature : Generally, it is very rare to see tanto existing that is older than middle
Kamakura period .Sadatoshi tanto was said that it does not exist any more.
After the war, it is said that there were two pieces. One is not found so the other that actually
only one existing is this one tanto of Sadatoshi. On the record, it is written that the former pieces
that he made were only Tachis.
Sadatoshi tanto has never been seen by the researcher therefor it is not studies at all.
When the other lost sword appears, the it could be studied deeply by comparing the two.
The 750 years old blade that was repeatedly polished, which has a distinctive characteristic
and elegance. It is just thankful for the sword being existing and we hold the sword to pray to
survive in the future. As one sword lover, I feel more blessed than one deserves.

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Appraisal Quiz #269 (December 6th, 2013)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 71.5 cm or 28.14 inches.
Sori : 1.6 cm or 0.62 inches.
Mekugi: 2
Width at the hamachi : 2.67 cm or 1.05 inches.
Width at the Kissaki : 1.65 cm or 0.64 inches.
Kasane : 0.55 cm or 0.21 inches.
Shape : It is standard size graceful tachi. It is well curved classical tachi figure.
It may be observed as a sword that is made earlier than Kamakura period.
Jitetsu :Itame wood pattern surface with mixture of wood grain mixture.
Hamon : Thin straight suguha temper line with some loose nie crystal grain.
There are some nijyuuba
Nakago: Oosuji chigai file marks. The signature is engraved deep and thick on the
back side of the nakago. Although it is quiet piece, it　is appealing.

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