What is the historical significance of Yongle Bao Tong in China?

Yongle Bao Tong was cast in the period of Judy, the founding emperor of Ming Dynasty. Its casting process is exquisite and very neat, and its calligraphy is also a must. It is one of the most exquisite coins in the currency history of China. In the early Ming Dynasty, these exquisite and neat Yongle Bao Tong coins played a very important role in foreign trade and became common coins in international trade 600 years ago.