Description

ITEM DESCRIPTION:

Comes with kimono or cotton bag. Comes with certificate of supein Nihonto. Comes WithJūhō Tōken Kenkyūkai Kanteisho Certificate. Comes with tokorusho photocopy (the original must remain in Japan).

KATANA “Bizen Osafune-jū Yokoyama Sukekane / Tenpō 3 (1832)”

1. Translation of the Torokusho (Registration Certificate)

Prefecture: Saitama
Issue date: December 22nd, 1982 (Shōwa 57)

Inscription (mei):

• (Omote) Bizen Osafune-jū Yokoyama Sukekane

• (Ura) Tenpō 3, February → 1832

Blade length: 71.1 cm 
Curvature: 0.5 cm
Mekugi-ana: 2

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2. Translation of the Authentication Certificate (Kanteisho)

Issued by: Jūhō Tōken Kenkyūkai
Date: August 29th, 2025 (Reiwa 7)

Statement:
“The above sword is hereby certified as genuine.”

Technical information:

• Attributed smith: Yokoyama Sukekane (Bizen Osafune lineage)

• Date: Tenpō 3 (1832)

• Type: Katana

• Hamon: Suguha (straight)

• Hada: Classified within itame/mokume mixture

• Length: 71.1 cm

• Curvature: 0.5 cm

• School: Bizen-den

• Historical notes: Mentions Sukekane’s relation to the Yokoyama family and their work during the Tenpō era.

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3. Technical Description of the Blade

Signature

Bizen Osafune-jū Yokoyama Sukekane — member of the Yokoyama branch, active in late Edo and known for clean Bizen-den workmanship.

Date

Tenpō 3 (1832).

Blade features

• Nagasa: 71.1 cm

• Sori: 0.5 cm

• Kissaki: Small, well defined

• Nakago: 2 mekugi-ana, excellent patina, well-cut mei.

Hada

Visible itame mixed with mokume, harmonious and characteristic of late Bizen-den.

Hamon

Straight suguha, with fine internal activity (ko-nie), typical of Yokoyama refinement.

Condition

Healthy blade, clean geometry, well-preserved polish.

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4. Koshirae Description

Tsuba

• Iron sukashi tsuba with Torii motifs.

• Classical maru/mokko-gata structure.

Fuchi-Kashira

Decorated iron dragon motives.

Menuki

Golden dragon pair, finely detailed.

Tsuka

• Black ito wrapping in hineri-maki style

• Samegawa intact

• Edo Period.

Saya

Glossy black lacquer; sageo in dark green.

A complete Edo koshirae, balanced and aesthetically consistent.

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5. Technical Summary