Hello I know the use of some chinese coins(3, or 6)tied with a red ribbon. The more used coins are from the Ching dinasty: Shun-Chi, Kang-Hsi, Yung-Cheng, Chien-Lung, Chia Ching, Tao-Kwong. I have some true older coins that these ones. About the X century After Christ(Tang/Ten States, Five Kingdoms Dinasties) They have at the anverse, four symbols: Kai Yuan Tong Bao, the squeare in the centre and the reverse have no symbols in the age. Could be useful these coins in Feng Shui or I have to use coins from the Ching dinasty? thanks