KangxiKuan Yong Tong Bao is a kind of coin with the largest amount, longest period and most editions in Japanese history, and also one of the most foreign coins flowing into China. It was first cast in 1626 (the third year of kuanyong, the 108th generation of emperor Shuiwei), and began to be cast in large quantities in 1636. At that time, all kinds of money stoves were cast in Japan. They were still in use until the beginning of Meiji. They circulated for more than 240 years. Later, they were abolished because of the demise of the Tokugawa Shogunate. Kuanyong Tongbao money has been flowing into China in the long-term trade and exchanges between China and Japan, and has been found all over China so far.
Kangxi Japan is the first country to imitate the Chinese square hole round coin. According to some experts, Japan began to follow the example of China's Tang Dynasty in 708, when the emperor and the same year (708, equivalent to the second year of Jinglong, Emperor Zhongzong of the Tang Dynasty) of Nara Dynasty began to cast "hetongkai" square hole round coins. By 1860's, there were 32 kinds of square hole round coins, among which "Kuan Yong Tong Bao" was the largest one.
In Ming Dynasty, the parallel system of banknotes, silver and copper coins was implemented, but the casting of copper coins was seriously insufficient. Among the 17 emperors of Ming Dynasty, only nine emperors had ever cast coins (for example, in Xuanzong period of Ming Dynasty, there were no coins in the decades after Xuande). Thus, the old copper money of Tang and Song Dynasties was allowed to flow in, which provided conditions for the private coinage of private money and the circulation of Japanese imitation money flowing into China.
Japan's "Kuan Yong Tong Bao" money has been circulating among Chinese people for many years. Until the early years of Qianlong's reign in the Qing Dynasty, it was only known by the government that it was suspected that the money was made privately, and that the "year" was also used, which was tantamount to rebellion. Therefore, Emperor Qianlong ordered the governors and governors of Jiangsu, Zhejiang and Fujian to open furnaces for sale. Fortunately, the staff of governor Zhuang Yougong of Jiangsu Province is well-informed and knows the origin. Therefore, Yin Jishan, governor of the two rivers, and Yu Gong, governor of Jiangsu Province, had a "sparse rank" to talk about the dragon's pulse, and Emperor Qianlong ordered that commercial ships should not carry Japanese money; those used by the people were bribed by the officials. At this point, the matter is over. There are very few and the price is expensive.