This is a very pleasing iron tsuba of the Tosa Myochin school. There was a group of tsuba makers who made large quantities of tsuba in Tosa during the late Edo period, that are generally known as Tosa Myochin. The production was similar to that of Akasaka, Hayashi and Nishigaki of Higo and Kyoto or Owari sukashi. However, they differ from the neighboring provinces of Iyo and Awa. The peak period was probably from the Bunka/Bunsei period (1804-1830) to the Kaei Anei period (1848-1860) and many among them were also helmet makers.
This is a very slightly oval katana tsuba measuring 2 15/16 inches or7.5 cm high by 2 7/8 or 7.2 cm wide. It has good thickness of 0.20 inches or 0.57 cm. The iron has a nice dark patina and there is no rust or corrosion. It is in excellent condition. And comes in a wooden box. This tsuba has NBTHK Hozon papers attesting to the validity of the attribution and the condition of the tsuba.