Previous answer is
Soshu Ju Tsunahiro (3rd Generation).
相州住綱広(三代)

Features: Soshu Ju Tsunahiro bore the family name Yamamura and was originally named Masahiro.
Later, he was summoned by Hojo Ujitsuna of Odawara and granted the character “Tsuna,” changing his name to Tsunahiro.
His works often feature carvings such as kenmaki-ryu with bonji and suken.
This blade is carved with bonji, a flowing kenmaki-ryu, dokko, and on the reverse side bonji and double bo-hi grooves.
In recent years, sword prices have risen considerably, making it increasingly difficult to find high-quality examples.
Particularly, works by Soshu Ju Tsunahiro with horimono are considered especially rare.

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Appraisal Quiz #898 (May 23rd, 2026)
Who made this sword do you think ?
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Blade Length: 68.2 cm (26.85 in).
Curvature: 1.2 cm (0.47 in).
Mekugi Hole: 3.
Width at Base (Motohaba): 1.76 cm (0.69 in).
Width at Yokote: 2.80 cm (1.10 in).
Thickness of rim (Kasane): 0.68 cm (0.27 in).
Sword Weight: 650 g.
Era: 1312, Showa era, Sagami, Saijyo Saku, 714 years ago.
Shape: On the omote side, double grooves are engraved, and a bo-hi groove appears.
Jigane: The jigane is exceptionally beautiful, showing a darkish tone with faint utsuri appearing.
Hamon: A suguha hamon with a soft appearance within the temper line, bright and clear overall.
A slight kinsuji can be seen beneath the boshi.

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