Previous answer is
　 Suishinshi Masatsugu(Kao) 　

Special feature:Suishinshi Masatsugu was a student of Taikei Naotane.
This blade's Nakago is very nice condition.
And Jitetsu is rather tight ko-itame with healthy condition.
Boshi is Notarekomi with deep Yaki. There are many activities, Kinsen
ans many Sunagashi and Yo in Ha.
Jitetsu and Hamon is bright, and this blade is the top quality in his blades.
On the surface, this blade is very similar to Taikei Naotane.

==============================================
Appraisal Quiz #573 (January 25th, 2020)
Who made this sword do you think ?
==============================================

Blade length : 65.1 cm or 25.62 inches.
Sori : 1.1 cm or 0.43 inches.
Mekugi : 3
Width at the hamachi : 2.83　cm or 1.11 inches.
Width at the Kissaki : 2.19 cm or 0.86 inches.
Kasane : 0.57 cm or 0.22 inches.
Shape : Rather wide blade. The Sori is small. because the blade is Osuriage.
Jitetsu : Ko Itame Hada well grained with Jinie attach.
There are Chikei. The Jigane is clean.
Hamon : Nie Deki, Middle Suguha with Ko Gunome Midare.
Tehre are Ko Ashi. The Nioikuchi is thick and bright.
Boshi is small rounded shape.

Hints. ※The picture will be enlarged

================================================

Answer will be posted at next Appraisal Quiz.

================================================

(Please acknowledge not replying to mail about Appraisal Quiz by our convenience.)