During the year, the Japanese puppet regime wantonly looted copper products in the areas it occupied, and in addition to using merchants to openly buy them in the countryside, it also forcibly expropriated them on a household-by-household and per capita basis, and the copper dollars and money accumulated by the people were almost completely looted.

The Wu area also became a Japanese-occupied area for a time, and naturally it was not unavoidable.

According to historical records, in the second year of Kanei (1625), Sato Shinsuke, a wealthy merchant in Mitoda Town, asked the government of the island country to mint Kanei new money.

After tired of drum casting, as long as more than 200 years, the category is quite varied, no less than 1,000 kinds, and the number is very large.

The bare back is the most common, and there are words (the most words "Wen" and "Yuan" are recited), stars, years, epochs (less "sixteen" on the back), epochs and ripples (when four coins) and so on.

The Yong character of the initial casting of Kuanyong Tongbao is generally composed of "Erhe Shui", which is called "Ershui Kuanyong", which has been handed down less. From the thirteenth year of Kuanyong to the early years of Kuanwen cast called "ancient Kuanyong", characterized by the end of the word Bao two or three strokes connected, called "even foot treasure", according to the casting time can be divided into more than 10 categories, among which "Shijin grinding big characters (the shape of the character is large and connected with the outline)", "fishtail treasure (the last two strokes of the treasure word from the middle to the left and right bend apart, shaped like a fishtail)", "long tail wide (large characters and the tail pen upwards to the top of the wide word)" and other versions are rare.

In addition, the styles of books such as "Sakamoto Herbaga (left half of Yongzi with cursive script)", "Sendai Poho (Bao character left high and right low)", and "Takeda Ikinaga" (Yongzi extra-large, low on the right side) have their own characteristics and the above types. Since the eight years of Kuanwen (1688) after the casting called "new Kuanyong", its characteristic is that the last two or three strokes of the treasure word are separated, called "Fenzu Bao", the outline is correct, the text is thinner, its version is more complex, in addition to copper coins, there are a large number of iron coins.

There are several kinds of new Kuanyong that are quite rare, such as some large wide-rim coins, slave coins (the inner outline of the back is very large and connected to the outer outline), small lead sample money, etc., and there is a kind of new Kuanyong with a back for the "White Crane Crossing the Sea Chart", which is extremely fine casting, and may belong to the furnace money.

In terms of coin material, there are gold, silver, copper, iron, lead, and copper coins are divided into red copper, brass, bronze, and red copper is the most common. Because of the excellent production, it was used by the people of our country at that time, and became the crown of the square hole round coins that flowed into our country.

As early as more than 2,000 years ago, the Han half tael and five baht coins were unearthed in many places in the island country, which is clear evidence.

By the Tang Dynasty, the two countries had closer contacts and sent envoys to each other, and the culture of the Tang Dynasty had a great influence on the island nation. Over the years, tens of thousands of Kaiyuan Tongbao coins of the Tang Dynasty have been unearthed.

The earliest square hole round money in the island country "and Tong Kaibao (Wang Er)" money is made of imitation of Kaiyuan Tongbao money, and it is also found in China.

In the Song and Ming dynasties, the economic exchanges between the two countries became more frequent, and China's coins continued to be exported to island countries in large quantities.

Later, the island countries imitated the year name money of the Song and Ming dynasties in China, and they also used Chinese characters with the same name.

These coins and other island coins have also flowed into our country in large quantities. Of course, Kuanyong Tongbao is the most common.

Kuanyong money is found in all parts of China's urban and rural areas, and it is even more common in the southeastern coastal provinces.

Because the name "Kanyong" cannot be found on the historical chronology of our country, many beginners are confused.

In fact, there are still many old ancient coins from neighboring countries circulating in our country, such as North Korea's "Changping Tongbao" and Vietnam's "Jingxing Tongbao (Jubao)" continue to be found.

It is the existence of these coins that reflects the great role played by China's ancient culture in history and culture, and has become a historical witness to the friendly exchanges between China and Japan and other neighboring countries.