Previous answer is
Special feature : Ko-Hoki school started by Yasutsuna
and his son Sanemorri who were working at Heian era(834).
At that period, Shimane and Tottori area were well known
Tamahagane productive places. So from ancient era,
many sword makers were making swords even modern times.
This sword was judged as Ko ho-ki by NBTHK shins which was made
more than 1000 years ago historical treasure sword.
Especially Ooitame hada which remind us old koto blade with Chikei and jinie.
The hamon is very soft feeling attractive hataraki.
Appraisal Quiz #285 (April 4th, 2014)
Who made this sword do you think ?
Hints. ※The picture will be enlarged
Blade length : 75.3 cm or 29.64 inches.
Sori : 2.3 cm or 0.90 inches.
Mekugi : 1
Width at the hamachi : 3.04cm or 1.19inches.
Width at the Kissaki : 1.89 cm or 0.74 inches.
Kasane : 0.67 cm or 0.26 inches.
Shape : The blade is regular size with deep sori and longer kissaki
nice well balanced sword. in the front. Bohi and soehi are engraved.
On the back. sunken and Tsume are engraved.
Jitetsu :Koitame had well grained with jinie attach beautiful texture.
Answer will be posted at next Appraisal Quiz.