C040765(W8568)
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Wakizashi signed Sagami-no-kami Fujiwara YASUYUKI

Shinto Early Edo perido (Kanbun era/about 350 years ago) Owari
Length of cutting edge 54.3cm Curvature 0.9cm Width of base 32.1mm Width of Yokote 23.0cm Thickness of base 7.2mm

NBTHK(Tokubetsu Hozon) certificate

Blade construction: Shinogi-zukuri, Iori-mune and harmonized cuve. Kasane is thick and massive volume in Hiraniku, heavy on hand (645 grams without Habaki). Mihaba width is wide at base, less degree of tapering from base to a extended medium Kissaki. (click HERE for super sized image of entire blade)
Forging(Hada): Forging mark is Itame-hada. Hiraji surface is covered with sparkling glitter so called Ji-Nie - crystallized particles where darkish Nie lines so called Chikei gushes out from steel. Shinogi-ji surface shows Masame straight grain mark.
Temper(Hamon): The blade features as its base forms in a style known as "Yakidashi" then flamboyant and high-tempered hamon of Choji-midare (clove patterns), Togari-ba (pointed elements), and Gunome (regular undulations). Tobiyaki (isolated tempering marks) activity further enhances its vibrant appearance. Within the Hamon in a soft Nioi base, with Ashi (legs) extending into the valleys of the gunome, streaming "Sunagash" and floating "You" - all demonstrating abundant and dynamic activity in Nie (crystalline martensite). The Ha-fuchi (edge line) is especially bright and clear due to thick clusters of fine Nie forming in the valleys of the Hamon pattern.
Bōshi (tip temper): The Hamon continues with gunome below the Yokote line, turning into a large rounded shape (ō-maru).
Nakago (tang): Ubu (unaltered), with Yasurime (file marks) in the style of ō-sujikai (gtreatlu slanting left). One Mekugi-ana (peg hole). The heel (Nakagojiri) is in Ken-gyo (V-shape) shape). The back ridge of Nakago is flat and decorated with kesho-yasuri (cosmetic file marks) in the ō-sujikai style. On the omote side along the Shinogi ridge is a long signature (chō-mei): "Sagami no Kami Fujiwara Yasuyuki" 相模守藤原泰幸.

The first-generation Yasuyuki 泰幸 was originally from Mino Province. With the establishment of Nagoya Castle in February of Keichō 15 (1610), he moved to Minami-Nagashima Town, located in the castle town of Nagoya (present-day Naka Ward, Nagoya City), where he engaged in swordsmithing and was granted the title "Noto-no- Kami" 能登守. Works signed "Noto no Kami Yasuyuki" 能登守泰幸 is known to be dated Kan'ei 8, 13, 15, 18, and 20 (1631–1643).

This particular piece is a long wakizashi by the second-generation Sagami no Kami Yasuyuki 相模守泰幸. His given name was Shinbei 新兵衛 and he resided in Nagashima Town alongside the first generation. Known dated works of his are from Kanbun 5, 7, 8, and 10 (1665–1670). Compared to the first generation, his signature and file marks are notably deeper. While the first generation's Nakagojiri is a blade-up kurijiri shape, the second generation's is ken-gyo.

The majestic and robust form of this wakizashi reflects the dignity of the samurai of Owari. The file marks and chisel work on the tang are clearly preserved, and the blade remains in excellent condition. This is a supreme example of Owari Shintō craftsmanship, showcasing a powerful ō-midare (large irregular hamon) in a vividly active tempered hamon. A masterpiece among the distinguished swords of Owari Shintō, forged by Sagami no Kami Fujiwara Yasuyuk i模守藤原泰幸.
Recent good polish/Condition scale: excellent - very good (using a scale of mint-excellent-very good-good-fair-poor).
Gold-foiled single-layer Habaki, Preserved in a plain shirasaya (wood scabbard).
Reference:
"Owari Tōkōfu" (Owari Swordsmith Registry), Nagoya City Board of Education, March 31, Showa 59 (1984)