Tang, Five Dynasties and Ten States
 
        "Wuzhu" coins were continuously used in the early Tang dynasty. The emergence of "Kaiyuan Tongbao" coins in A.D. 621 marked the end of the "Zhu" and "Liang" currency systems.Coin casting and circulation entered a chaotic period during the period of Five dynasties and the Ten States. Inferior quality lead and tin coins were circulated in the market. The "Duiqian" currency system (two coins with same name, size and weight, but differ in script) of the Southern Tang dynasty continued during the Song dynasty.
 
 
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