In approximately 350 BCE, the Chinese started to produce round coins through a process of pouring molten metal into a mould, where it then cooled. Two noteworthy features of these coins were a spike on the edge where the mould had an opening (these were cut and then filed off) and a square hole in the middle. At that time, people believed the earth was square shaped, and that coins could ward off evil spirits. The round edge of the coin was said to symbolise heaven surrounding the earth. This is a Chinese cast coin from the National Coin Collection.
Chinese Cast Coins
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