Muromachi turned sword making into an industry: the uchigatana rose with massed infantry warfare, Osafune and Seki produced bundle swords beside custom orders, and the Ming trade carried Japanese blades abroad by the tens of thousands.
There is no zokumei, but the smith is Jurozaemon-no-jo Harumitsu. Harumitsu was the great-grandson of Ukyonosuke Katsumitsu, who served Akamatsu Masanori, the Shugo Daimyo of Bizen, Harima, and Mimasaka; there is a moroha-zukuri tanto dated a lucky day in the 9th month of Koji 3 with the mei "Shugen Iechika" (Yokota Takao, Shojimei no aru Sue-Koto). This was a custom order for Mimura Iechika, the hegemon of Bitchu, which signifies that the high-quality swords of Harumitsu received great support from the heroes of the Sengoku period such as the Mimura clan.
Offered by Choshuya
We couldn’t find current papers for this piece. Ask the dealer whether it has been, or can be, submitted to shinsa. — Hoshi

As written by the shop
Machine translation from the shop's Japanese · may contain errors ·
Bizen · around 1504-1521
Tōken Taikan top 26%
The Muromachi period (1392 to 1573)
Muromachi turned sword making into an industry: the uchigatana rose with massed infantry warfare, Osafune and Seki produced bundle swords beside custom orders, and the Ming trade carried Japanese blades abroad by the tens of thousands.
We could not find an authenticity certificate on the seller’s listing. Japanese swords and fittings are normally papered by the NBTHK (or the NTHK). Without one, the attribution is the seller’s own assessment and has not been independently verified — treat it with caution and ask the dealer about certification before buying.
If, due to our fault, the item differs significantly from its proper condition, the item may be returned. Cooling-off is within one week of the item's arrival.
¥800,000