Ordering Number: AS24564
Tanto in Shirasaya (NBTHK Tokubetsu Hozon Token)
Signature: Gassan Sadayoshi Saku
Inscription: Banzairaku
月山貞吉作
万歳楽
Shinshinto: Jyo Saku: Settsu
We divide 4 sections for each sword as Saijyo Saku, Jyojyo Saku, Jyo Saku and Regular Saku.
This piece is ranked as Jyojyo Saku among the works of Gassan Sadayoshi.
Habaki: Wooden habaki integrated with the handle.
Blade Length: 27.4 cm (10.79 in)
Curvature: 0.1 cm (0.04 in)
Mekugi Hole: 1
Width at Base (Motohaba): 2.51 cm (0.99 in)
Thickness of rim (Kasane): 0.53 cm (0.21 in)
Sword Weight: 155 g
Era: Late Edo period, around Ansei era (1854–1860)
Shape: A well-shaped piece with solid width and thickness.
Jigane: Ko-itame hada, well-forged and of refined quality.
Hamon: Ko-nie style suguha, with soft and bright nioikuchi, boshi turns down with a small round shape (komaru).
Features: Gassan Sadayoshi was a swordsmith of the Gassan school from Dewa province and a student of Suishinshi Masahide.
He was known as Yahachiro.
There are works dated to Tenpo 6 (1835), suggesting he began forging around that time.
He passed away in February of Meiji 3 (1870).
He is famous as a smith of the Gassan lineage, and together with Gassan Sadakazu, he worked on recreating Gassan-hada and ayasugi-hada (mainly Sadakazu).
In any case, he is renowned as a prominent swordsmith of the Gassan school.
Aoi Art’s Comment: “Banzairaku” is the name of a Gagaku (ancient court music) piece.
It is a representative dance of Tang origin (Togaku), performed by four dancers in Heichō style wearing layered costumes with the right shoulder uncovered.
It is said to have originally come from China and imitates the sound of birds.
In the context of this sword, it likely symbolizes a joyful event or celebration.
Historical Background: Towards the end of the Edo period, warfare intensified, leading to a significant increase in sword production.
NBTHK Tokubetsu Hozon Token
Aoi Art estimation paper / Whole Oshigata
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Auction Starting Price:450,000JPY
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