Tenpō Tsūhō
The Tenpō Tsūhō (Japanese: 天保通宝; kyūjitai: 天保通寳 or 天保通寶) was an Edo period coin with a face value of 100 mon, originally cast in the 6th year of the Tenpō era (1835). The obverse of the coin reads "Tenpō" (天保) a reference to the era this coin was designed in, and "Tsūhō" (通寳) which means "circulating treasure" or currency.