Previous answer is
Nagasone Okimasa

Special feature : Nagasone Okimasa was generally called Atsubee who was a student of Kotetsu and become adopted later on.
Nagasone Okimasa has made swords with Kotetsu. He spent most of his life producing swords of his mentor.
Kotetsu has been making swords for 20 year which is not a long period of time yet there are quite an amount of katana existing.
Therefore it is most likely that Okimasa and other wordsmiths has helped making swords for Kotetsu.
One of the reason that made Kotetsu so famous is because of the sharp and bright ha and fine jigane.
Once on the auction in London, I was impressed by the bright ha of KOmetsu and the high quality jigane. It is over 30 years ago but
it is still burnt in my mind.
Now this Nagasone Okimasa is wakizashi but the fine jigane and the bright hamon is no different of Nagasone Kotetsu. It is
a masterpiece indeed. We highly recommend this blade.

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Appraisal Quiz #259 (September 13, 2013)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 51.9 cm or 20.43 inches.
Sori : 1.3 cm or 0.51 inches.
Mekugi : 1 is open, 1 is filled.
Width at the hamachi : 2.45cm or 0.96 inches.
Width at the Kissaki : 1.55 cm or 0.61 inches.
Kasane : 0.5 cm or 0.19 inches.
Era :Early Muromachi period.
Shape : The blade is about 2cm Machiokuri and regular size with deep sori nice looking shape.
In moot side, double bo-hi and Bonji are engraved and revers side, Suken and bonji are engraved.
Jitetsu :Koitame had well grained with jinie attach and utsuri appear beautiful texture.
Hamon : Koniedeki sugiha base and kogunome midair with thick soft nioikuchi and ashi, yo work.

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