Iron Bushu School Tsuba Decorated with Sakura and Waves
Iron Bushu School tsuba decorated with sakura and waves. This tsuba is not signed however I have found very similar tsuba signed "Bushu Masatoshi", picture of which is at the bottom of section with photos. While I am not sure If Masatoshi made it, it definitely points out to him or someone closely related, like master or student.
Masatoshi was a student of Masatoyo. He worked for the Tsuyama fief of Mimasaka Province but from Edo Yushima. There are tsuba extant of his student "Toshimasa" that were made after Masatoshi work.