China is divided into three periods with the currency: the natural sea shell period, the artificial imitation shellfish period, and the metal casting period. my country's use of Bei as currency is wider, and its lasted time is also long. In a few areas in Yunnan, the currency of Bay in Yunnan has been extended to the Ming Dynasty or later. Individual places are still using shell as currency until the Republic of China.
China is divided into three periods with the currency: the natural sea shell period, the artificial imitation shellfish period, and the metal casting period. my country's use of Bei as currency is wider, and its lasted time is also long. In a few areas in Yunnan, the currency of Bay in Yunnan has been extended to the Ming Dynasty or later. Individual places are still using shell as currency until the Republic of China.