Period: circa 1596 (Edo era).
Sugata: Shinogi-zukuri, tori-zori, and iori-mune. Gomabashi on ura, and bo-hi on omote.
Overall length: 23.90 inches (607.06 mm).
Nagasa: 18.90 inches (479 mm).
Nakago: 5.00 inches (127.00 mm). O-suriage, shortened by at least 2.4 inches (60 mm). The yasurime are not clear, due to patination. The nakago-jiri is iriyama-gata.
Kissaki: Chu-kissaki, 1.43 inches (36.40 mm). Komaru boshi.
Moto-haba 1.20 inches (30.5 mm); Saki-haba: 0.82 inches (20.90 mm). Moto-gasane 0.27 inches (6.9 mm). Saki-gasane: 0.21 inches (5.30 mm).
Sori: 0.24 inches (6.00 mm).
Hamon: Suguha, nie-deki, kinsuji yubashiri, inazuma.
Hada: Itame hada and chikei in jitetsu. Quite a dense jihada, indicating a quality sword.
Blade condition: The blade is fully polished and in excellent condition.
In shirasaya. Unusual gold and black habaki.
Highly unusual to see different hi on either side of the blade.
The NBTHK attributed this sword to the Naminohira school of Satsuma Province. This school was founded before the Kamakura Period and thrived until the end of the Edo Period. Quite a few Naminohira smiths appear in Kaiho Kenjaku (1797) and Kokon Kaji Biko (1830), which rank the best blades according to sharpness. In Japan, this ranking has played an important part in estimating the quality and value of a blade.