It's true. The five emperors' money in Gan Yuan Pavilion is real money, and ancient money is thicker than fake money. At that time, the technology of making money was not so modern, and it was impossible to make more valuable money. The edges of ancient coins are smooth, and they have been polished a lot in the long-term use, so they are smooth. Fake money is made in batches, and the edges are not processed, and there are obvious right angles.