"Dinghu Longevity Palace" should be introduced: "Dinghu Longevity Palace" should be: diameter 16.8CM, narrow edge wheel 0.8-1.0CM. Weighs 0.765kg. When the single string pattern is raised on the inner side of the face wheel, be careful of the word "Gong", and the positive cross double line boundary is extended outside. This palace is one of the palaces in Shanglinyuan of Han Dynasty, located in Jiaodai Town, Lantian. It is said that Xuanyuan ascended to heaven at Ding Lake in Lantian.