Chinese Ancient Currency, History of Ancient Chinese Money
https://www.chinahighlights.com/travelguide/culture/chinese-ancient-currency.htm
WEBGenerally speaking, most of the copper coins are round and there is a square hole in the center of the coin, hence there is another Chinese name called 'fangkong cash' (Fangkong, means square hole) and a nickname called 'kongfang brother'. People can distinguish different kinds of copper coins by the letters marked on the coins.
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