Previous answer is
Tsuchiura-shin Nagao Fujiwara Shinkei Tanemitsu Tsukuru (kao)
Dated February, Keio 3 (1867)
土浦臣長尾藤原心慶胤光造(花押)
慶應三年二月日

Features: Shinkei Tanemitsu was born on April 14, Tenpo 3 (1832), in Hitachi Province (present-day Ibaraki Prefecture).
He became a disciple of Naotane and later served as the official swordsmith of the Tsuchiura Domain.
His workmanship closely resembles that of Naotane.
Examples of such extraordinary length combined with such robust proportions are extremely rare.
This is a remarkable work.

=====================================
Appraisal Quiz #902 (June 20th, 2026)
Who made this sword do you think ?
=====================================

Blade Length: 70.61 cm (27.80 in).
Curvature: 1.82 cm (0.72 in).
Mekugi Hole: 2.
Width at Base (Motohaba): 3.05 cm (1.20 in).
Width at Yokote: 2.12 cm (0.83 in).
Thickness of rim (Kasane): 0.76 cm (0.30 in).
Sword Weight: 780 g.
Era: Muromachi period, around the Tensho era (1573-1592).
Shape: Approximately 3 cm (1.18 in) of suriage with the machi moved upward (machi-okuri).
Jigane: Well-forged ko-itame hada with a fine steel texture and visible utsuri.
Hamon: Nie-deki suguha with small ashi.
The boshi becomes irregular toward the tip.

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

Answer will be posted at next Appraisal Quiz.

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

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