Previous answer is
　 (Unsigned) Mumei (Aoe)
無銘（青江）

Special feature: Aoe, Bizen Province
Aoe is the swordsmith school florishd from the Kamakura period to the Nanbokucho period around Takahashi river in the west of Okayama pref, and left many masterpiece. Those from around the mid-Kamakura period to the Nanbokucho period are called Aoe, and those before the Nanbokucho period are called Koaoe(old Aoe).
This Aoe sword stands out for its exceptional craftsmanship and intense reflection on the blade. It is highly praised by experts, including Professor Tanano, for its outstanding quality.

==============================================
Appraisal Quiz #777 (January 13th, 2024)
Who made this sword do you think ?
==============================================

Blade Length:71.2 cm or 28.03 inches
Curvature:1.0cm or 0.39 inches
Peg holes: 1
Width at base: 3.15cm or 12.20 inches
Width at tip: 2.2cm or 8.66 inches
Thickness: 0.74cm or 0.29 inches
Sword Weight: 24.87 ounce
Shape: This piece has a wide body, slightly thick thickness, and a slightly shallow curvature, with a usual body structure.
Jigane: Ko Itame Hada well grained. The Jigane is clear and beautiful. A Kizu can be seen about 7 cm from the Hamachi on the right side.
Hamon: Sudareba Hamon. Bosho is Midarekomi and Hakikake style.

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

Answer will be posted at next Appraisal Quiz.

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

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