It was cast during the reign of Emperor Yelü Yanxi of Liaotian (1101-1125 AD). There are small flat, fold five and fold ten types. Generally, small flat money is more common, folding ten large money is only seen, and the Shanghai Museum has a collection. As shown in the figure, it is the red rust of the folding ten large coins, which is mutually corroborated with the contemporary Song qian. This coin is poor in appearance and is also related to its copper, which contains tin and is prone to rust.