Previous answer is
Kunimitsu(Shintogo) (新藤五国光)
Special Features: This Tanto was made by Shintogo Kunimitsu, two Kanji character.
The oldest Shintogo is from the Eijin era, and its children include Kunihiro, Kuniyasu, and Kunishige.
Accoring to one theory, they were later named Kunimitsu.
First of all, it is distinctive that the signature is clearly visible.
The Kinsuji well on the Suguha Hamon which is the specialty of Kunimitsu.
In the Jigane thare are many Chikei and bright.
==============================================
Appraisal Quiz #769 (November 18th, 2023)
Who made this sword do you think ?
==============================================
Blade Length: 30.3 centimeters11.93 inches
Curvature: 0 cm
Mekugi-ana (Peg hole): 1
Motohaba (Width at the base): 3.11 centimeters 1.224inches
Kasane (Thickness): 0.67 centimeters 0.264inchs
Weight of the sword: 305 grams
This work is a masterpiece with carvings of a spear and a flag on the
blade. The tang of the sword is also engraved with the same design.
Jitetetsu (Iron): Beautifully carved Hada.
Hamon (Temper line): It features a straight temper line with visible nie (fine martensite crystals), and a healthy initial edge of about 4 centimeters remains, allowing one to appreciate its quality. Furthermore, the absence of rust is remarkable.
================================================
Answer will be posted at next Appraisal Quiz.
================================================
(Please acknowledge not replying to mail about Appraisal Quiz by our convenience.)