A very nice koto era tanto, mumei and gorgeous Bizen workmanship. This sword is not signed but appears to be by the Bizen Suke sada group of smiths and from the muromachi period. There were many Suke Sada smiths working at this time and this could be one of many if attributed to this group. It is constructed in typical bizen fashion with wide tang, a classic Bizen trait. The hamon is Gunome Midare in notare with much activity and plenty of nie with nioi. The hada consists of burls of mokume blended with itame and interspersed with O-hada. Clear utsuri appears throughout the blade which is virtually flawless as can be seen.

The mounts consist of a lacquered saya with crushed abalone shell suspended within. There are gold embossed menuki of Dragon motif. A very nice package . There is a Kodzuka/Kogai which appears to be of a Noh play scene and very entertaining. The Aikuchi style koshirae are a rarer version that fit very nice and hold tightly together. These Aikuchi mountings are of  iron with gold floral sand dollar like motif that is very mon like with some key fret imagery and Buddhist like symbols also. The tsuka-ito is blue with matching sageo contrasting nicely with the old Same. There is a gold washed habaki to finish.

The blade is an excellent example of a Bizen Koto tanto and all that is left to complete this package is to submit it to shinsa. This blade should paper very well.