Previous answer is
Special feature : Nagasone Okimasa was generally called Shoubee who
was a student of Kotetsu and become adopted later on.
Nagasone Okimasa is oftenly called 2nd generation Kotetsu.
He became adopted son of the Kotetsu and have continued
forging swords while being an assistant of Okinao and Okihisa.
So he was called second son of Kotetsu who was a
top ranking swordsmith in Shinto era.
This blade has deep Nioikuchi. And there are many works in Ha.
It was impressed with long Kinsuji and bright Chikei.
It is rare blade which is quite good work of Okimasa or Kotetsu.
We highly recommend this masterpiece blade.
Appraisal Quiz #327 (February 6th, 2015)
Who made this sword do you think ?
Hints. ※The picture will be enlarged
Blade length : 70.4 cm or 27.71 inches.
Sori : 2.2 cm or 0.86 inches.
Mekugi : 1
Width at the hamachi : 2.85 cm or 1.12 inches.
Width at the Kissaki : 1.85 cm or 0.72 inches.
Kasane : 0.665 cm or 0.26 inches.
Shape : Regular size, Osuriage Mumei katana with deep Sori.
Jitetsu : Ko-Itame Hada well grained with Jinie attach. There are Utsuri.
Hamon : Suguha style bright Ko-Ashi attached. Boshi is round Hakikake style.
Answer will be posted at next Appraisal Quiz.
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