Later Zhou Dynasty wan li tong bao tai he zhong bao tai he tong bao tai he zhong bao tai ping tong bao Tai Ping zheng de tong bao qi xiang zhong bao qian qiu wan sui tong bao zhou yuan tong bao “Large Coin of the Five Elements” Several examples wu xing da bu zhou yuan tong bao examples This Liao Dynasty coin zhou yuan tong bao tai ping tong bao tai ping