唐朝开元通宝一组7枚，一枚背丹，一枚背星月，其餘光背，当时一两等如二十四銖, 首枚中乾评78，其餘VF至EF. 故唐代以十文兑一两的算法比汉代五銖钱更為直接方便，另外，开元通宝是中国史上第一枚「宝」為

唐朝开元通宝一组7枚，一枚背丹，一枚背星月，其餘光背，当时一两等如二十四銖, 首枚中乾评78，其餘VF至EF. 故唐代以十文兑一两的算法比汉代五銖钱更為直接方便，另外，开元通宝是中国史上第一枚「宝」為名之古钱，寓意「宝藏」，充分反映社会对金钱之重视，开元通宝亦是中国史上最重要钱币之一，。China: Tang Dynasty, Kai Yuan Tong Bao of the Dan Province Mint (in modern day Shaanxi), (618-907), Chinese character Dan on top of reverse variety, measuring 25.5x1.2mm, weighing 3.5g and also Kai Yuan Tong Bao, star and moon on upper quadrant, and 5 pieces in ?cupro-nickel, During that time, 1 tael was made up of 24 zhu, so Tang Dynastys 10 cash being equivalent to 1 tael is far more convenient when it comes to conversion compared to the Wuzhu (5 zhu) coin system used since the Han Dynasty, thus paving the way of the Chinese metric system to the modern decimal system. Moreover, Kai Yuan Tong Bao is the first Ancient Chinese coin to be named Bao, meaning treasure and this was a relfection of how society valued the power of money, making Kai Yuan Tong Bao one of the most significant cash coin in Chinese history. the first coin Zhong Qian 78, the rest very fine to extremely fine. . (7) [42, 44 and 46]