After the unification of the six countries, Qin Shihuang decided to unify the laws, weights and measures, currency and writing, abolish the old coins of the six countries at the end of the Warring States period, and improve them on the basis of Qin Banliang's money in the Warring States period. Qin Banliang's round square hole coins swept the country, ending the chaotic state of different shapes and weights of money in ancient China.
classify
Category I: Money has a large diameter, the largest is 3.7cm, generally above 3cm, and the heaviest is 1 1g, generally between 6 and 6-7g. Most of the money is irregular, and there are copper coins flowing around. Qian Wen is simple and extensive, without certain specifications. It is considered that the clay model is adopted. A total of 148 pieces, accounting for 16% of the total.
The second category: money varies in size, relatively small, light and thin. Generally, the diameter of money is 2.5-2.8cm and the weight is 3-6g, so the casting is poor. A total of 738 pieces, accounting for 79.80%.
The third category: heavy, large and thick specifications, standardized, with a diameter of 3-3.2cm and a weight of about 6g, equivalent to 85,6 kg-* 2 Zhu made in Qin; The thickness is 0. 15cm, and the money is square. Advanced casting technology.