Description
Authentic Nihontō Japanese Sword Katana Signed by Naminohira Yasuuji 波平安氏 NBTHK TOKUBETSU HOZON TOKEN Certificate
The Naminohira school is a lineage of swordsmiths that has continued uninterrupted since the Heian period. This particular smith, 安氏, is the son of 安常, the 59th head of the Naminohira main family, and 安氏 himself became the 60th generation swordsmith. His common names were 橋口勘之丞 and 甚之丞, and in Kyōwa 2 (1802), he changed his signature from 安氏 to 安行.
This sword has a well-balanced width difference between the base and the tip, with a slightly extended 中切先 (medium tip). The curvature is shallower above the tang. The steel has a well-forged 杢目 (wood grain) pattern that is tightly packed, and the blade edge flows with a beautiful 柾目 (straight grain). The hamon is a bright and clear 直刃調 (straight temper line) mixed with shallow waves and 互ノ目 (irregular clove patterns), creating a deep nioi. 金筋 (kin-suji) can be seen in various places along the edge, and thick kin-suji, resembling potato vines, are notably visible within the hamon. The boshi (tip) returns to a large round shape on both sides. The balance is excellent with a center of gravity towards the hand, and there are no noteworthy flaws, making it an ideal sword for appreciation.
Bare weight: 698 grams.
Nihontō Information
| Name 名称 | 波平安氏 - Naminohira Yasuuji |
| Blade Length 刀長 | 二尺二寸七分零厘強 / 68.81 cm |
| Sori 反り | 二分七厘 / 0.82 cm |
| Blade Width 元幅 | 30.3 mm |
| Blade Thickness 元重 | 6.8 mm |
| Tip Width 先幅 | 物打22.8 mm 横手位置19.0 mm |
| Tip Thickness 先重 | 物打5.6 mm 松葉位置4.6 mm |
| Mekugi-ana 目釘穴 | 1個 |
| Age 時代 | 江戸後期寛政頃（1789～）The latter period of Edo era(18th century）) |
| Certificate 鑑定書 | 甲種特別貴重刀剣認定書(NBTHK Kōshu Tokubetsu Kichō Tōken Certificate) , 特別保存刀剣鑑定書(NBTHK TOKUBETSU HOZON TOKEN Certificate) |
| Registration 登録 | 昭和44年9月24日 三重県登録 Registered on September 24, 1969, in Mie Prefecture |
| Included 附属 | 素銅地金着はばき (Copper Habaki with Gold Foil) |
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