The scope of this problem is a bit large, because the amount of Kaiyuan Tongbao coin minting is very large, the circulation time is also very long, there are many editions issued, and the prices of various editions are far apart.
Kaiyuan Tongbao was minted by Tang Gaozu in the fourth year, and in order to rectify the chaotic currency system and follow the strict norms of the Western Han Dynasty's five baht, the Kaiyuan Tongbao was minted to replace the Sui five baht left in society. .........................
The Tang Dynasty always used Kaiyuan Tongbao, and after the fall of the Tang Dynasty, Kaiyuan Tongbao did not withdraw from the historical stage. During the Five Dynasties and Ten Kingdoms period, the Later Liang, Later Jin, Min, Southern Han, Southern Tang, Wuyue and other regimes still minted and circulated Kaiyuan Tongbao. ..............................
The examination found that until the beginning of the Song Dynasty, there were still Kaiyuan Tongbao minted, and even during the Qing Yongzheng period, there were still a large number of Kaiyuan Tongbao circulating in the market in the remote areas of Liangguang, and later the Qing Dynasty imperial court specially approved the exchange of Yongzheng Tongbao. In fact, the circulation of Kaiyuan money continued until the end of the Qing Dynasty.
Due to the huge amount of Kaiyuan Tongbao in existence, so the price of ordinary Kaiyuan Tongbao Small Flat Money is very low, when I played collecting in the early 90s, the good quality of The New Century Small Flat Money is only one or two dollars a dollar, and no one wants the difference in quality at all.
There are more than a dozen versions of the common Kaiyuan Tongbao. There are large character versions, large character narrow yuan, sloppy, tolerant weak, short head yuan, straight yuan, 尨字, low head pass, flat head pass, small character, small pass, small pass, small pass small treasure. Among them, the large character version, the large character narrow yuan, the vigorous, the weak, the small character and the small character are featured versions, the price is higher, and the current market price of other versions is within 100,000 yuan.