good quality coin. Though Chinese coins would continue to circulate in Eastern Japan, the confusion and chaos caused by the Bitasen coinage caused rice to replace copper coinage in Western Japan. From 1608 onwards it was illegal to pay with Bitasen, and the shogunate opened more mines for the production of copper, silver, and gold coinages. Despite this, however, Bitasen continued to circulate within Japan, but from 1670 the Eiraku Tsūhō was completely prohibited from circulation and depreciated in favour of the Kan'ei Tsūhō. Kan'ei Tsūhō In 1636, the Kan'ei Tsūhō (Kyūjitai: 寛永通寳 ; Shinjitai: 寛永通宝) coin was introduced by the government of the Tokugawa shogunate as a means to standardise copper coins and keep up a sufficient supply of copper coinage, being the first government minted copper coin in 700 years, despite this however they were introduced in the Mito domain 10 years prior during the 3rd year of the Kan'ei era. These coins would become the daily currency of the common people and would be used for small payments. Due to the isolationist policies of the Tokugawa shogunate, the outflow of currency halted and Kan'ei Tsūhō coins would continue to stay the main coin circulating in Japan. Kan'ei Tsūhō were minted for 230 years despite the fact that the Kan’ei era ended in 1643, and coins would continue to bear the Kan’ei legend, even when a new denomination of the coin was introduced a century later, though they weren't all uniform as the shogunate outsourced the mintage to regional and local merchants who would cast them at varying weights and sizes, as well as occasionally having local mint marks. By the 1650s 16 private mints were opened for the production of Kan'ei Tsūhō coins all over Japan. Kan'ei Tsūhō produced before 1688 are referred to as “old Kan’ei” and are recognisable by their similar calligraphic styles making them hard to differentiate from one another, meanwhile Kan'ei Tsūhō coins produced after 1688 (or “new Kan’ei” coins) tend to be more diverse in calligraphic styling, and the 4 mon denomination has waves on its reverse making it easily distinguishable from other coins. From 1738 the government authorised the manufacture of iron Kan'ei Tsūhō 1 mon coins, and in 1866 (just before the end of the Edo period) iron 4 mon Kan'ei Tsūhō were authorised. While iron coins were being minted, the quality of copper coins would decrease due to frequent