Chongning Heavy Treasure was cast in the Chongning period of Huizong in the Northern Song Dynasty (A.D.1102 ~1106), and the coins were copper, iron and silver. Chongning's treasure is the official script copper and iron, which is well-made and has been preserved for many times. In addition, Chongning's calligraphy is thin and golden, with iron and silver hooks, which is full of elegance and superb calligraphy. It can be called the peak of regular script in currency. The world appraised it as "the first spring in the Song Dynasty", and together with Xin Mang, it was called "the Thousand Laws of China".
"Double Saints", the layout of Chongning Bao Tong is changeable, and there are iron money.