Previous answer is
Suishinshi Masahide (3rd generation)/Keio 2 Nen 2 Gatsu Hi
Special feature: Suishinshi Masahide the First forged this wakizashi.
It is an accepted theory that he was the founder of Shinshin-to.
Masahide was born in Dewa province, present Yamagata pref.
in 1750. It is said that he learned in his youth under Kunikane the Forth
at Sendai or a smith forging farming tools. Masahide went to Edo
and learned under Miyakawa Yoshihide, a swordsmith of Shitahara school on the introduction of a certain samurai at the age of 22.
Masahide started serving the Akimoto family in 1774
and studied the method of forging sword from an independent
standpoint. A daimyo; a feudal lord gave Masahide foreign steel called
Namban-tetsu to study. On early works he was fond of brilliant
Toran-ba modeled on Sukehiro that had a tendency to break
so he tried to the revival of Koto blade forged in the Kamakura period aimed at the sharpness.
He went to Edo in 1781and learned Bizen-den under Ishido Korekazu, Soshu-den under Tsunahiro.
Masahide was also an educational swordsmith to discipline an array of excellent pupils;
Taikei Naotane, Hosokawa Masayoshi, Chounsai Tsunatoshi and others.
Masahide passed away in 1825, aged 76.
Appraisal Quiz #645 (June 19th, 2021)
Who made this sword do you think ?
Blade length : 66.67cm or 26.24 inches.
Sori :1.82 cm or 0.71 inches.
Mekugi : 2
Width at the hamachi : 2.78cm or 1.09 inches.
Width at the Kissaki : 1.89cm or 0.74 inches.
Kasane : 0.59cm or 0.23 inches.
The weight of the sword 520 grams.
Shape : O-Suriage Mumei sword with regular width. Sori is deep and Kissaki is longer.
Jigane : Ko-Itame-Hada with Masame nagare, with jinie attached and Midare-Utsuri is visible. Chikei is worked. Boshi is round shape.
Hamon :Konie deki rather round shaped gunme midare Ruth deep nioikuchi Ashi, Kinsuji, Sunagashi worked.
Answer will be posted at next Appraisal Quiz.