Period: Probably Kan'ei to Shoho (1624-1644).
Sugata: Kanmuri-otoshi-zukuri based on shinogi-zukuri, tori-zori, iori-mune, naginata-hi.
Overall length: 25.67 inches (652.00 mm).
Nagasa: 20.31 inches (516.00 mm).
Nakago: Ubu, 5.35 inches (136.00 mm). Kiri yasurime, one mekugi-ana, iriyama-gata nakago-jiri.
Kissaki: Chu-kissaki, 1.34 inches (34.00 mm), ko-maru boshi.
Moto-haba: 0.85 inches (21.6 mm). Saki-haba: 0.83 inches (21.00 mm). Moto-gasane: 0.21 inches (5.40 mm). Saki-gasane: 0.17 inches (4.20 mm).
Sori: 0.32 inches (8.20 mm).
Hada: Itame mixed with masame.
Blade condition: In fresh polish with some openings. See pictures.
The koshirae have been restored. The Edo period fuchi-kashira are of gold, silver and possibly shakudo. They depict tigers, as do the gold menuki. The gilt and copper kozuka handle, which is also Edo, depicts three playful tigers. The Edo period iron tsuba bears a mon.
The sugata is unusual - sufficiently unusual as to identify it as probably the work of Mino Kanetaka of the Mino school. It is very similar to this sword.