Heianjo Tsuba. The Muromachi period (室町時代 Muromachi jidai, also known as the Muromachi era, the Ashikaga era, or the Ashikaga period – from approximately 1336 to 1573). Depicts a vine and kaji (paper mulberry tree) leaf. Kaji leaf was a family crest (mon) of Suwa clan. Round (Maru Gata) form, diameter 79 mm. Iron, hira-zōgan brass inlay.
Wikipedia: Suwa Yorishige (諏訪頼重) (1516–1544) was a Japanese samurai and head of the Suwa clan. He was defeated by Takeda Shingen and his daughter Suwa goryōnin (諏訪御料人, real name unknown) was taken as Shingen’s concubine. She later gave birth to Takeda clan heir Takeda Katsuyori. Suwa Yorishige fought Takeda Nobutora in the 1531 Battle of Shiokawa no gawara. Suwa Yorishige was then defeated by Takeda Shingen in the 1542 Battle of Sezawa and Siege of Uehara. Following the Siege of Kuwabara, he committed suicide.
On Suwa clan: The origins of the Suwa of Shinano province are not entirely clear, but one theory holds that they were descended from Minamoto Tsunetomo (894-961). They were defeated by Takeda Shingen in the middle of the 16th Century and were afterwards Takeda vassals.
The same family crest is present on the kimono of Saito Tarozaemon Toshiyuki played by actor Morita Kan’ya XI (woodblock print by Utagawa Kunisada, 1860, in this collection).