This is a very powerful wakizashi by the Jo-saku rated smith Aizu Kanesada. Kanesada worked around the Ansei era (1854) in Iwashiro. He is the tenth generation Kanesada from Ôshû. His works extend from the end of Bunsei (ca 1830) to Bunkyû (1864).
This wakizashi is made in the shape of a naginata-naoshi. This was a very popular shape around the 1850’s. It is signed Ôshû Jû Kanesada (奥州住兼定). It is dated Ansei Go Nen Haru. This means made in the spring of the fifth year of Ansei (1858). It has a nagasa of 16 and 1/16 inches or 40.8 cm. The moto-haba is 1.5 inches or 2.9 cm and the saki-haba is 1.12 inches or 2.8 cm. The sori is 0.6 inches or 1.52 cm and the Kasane is 0.3 inches or 0.8 cm.
The naginata shape is strong and the hamon is a robust and florid nie based gunome midare that becomes a very slightly notare suguha once it enters the extremely large kissaki. Within and above the hamon are many activities such as chikei, ara nie, sunagashi, etc. Just lovely to look at for hours. The hada is itame based with areas of mokume. Within the ji are areas of clouds of floating nie. The hamon comes to a sharp ko-maru point and turns back down the mune extending about half way down the back of the blade. All in all, very impressive.
This blade comes in an old shirasaya with a sayagaki from Yoshikawa Koen the founder of the NTHK sword group in Tokyo. It also comes with what I believe is its original one-piece copper habaki. This sword does not as yet have papers but the former owner felt that a sayagaki by Yoshikawa Koen was as good as papers and I tend to agree. However, I will absolutely guarantee that this blade will paper if submitted to the NBTHK by its new owner.