"Great summer is really prosperous", a word coined during the Sixteen Kingdoms period. It was cast in the year of "Zhenxing" in Xia Lian (AD 4 19-424). "Hero Zhenxing" is an excellent caster with a diameter of 2.2-2.3 cm and a weight of about 2.8 grams. Among them, "Tai" and "Da" are interchanged and read clockwise, and the inscription "Taixia Revitalization" with a slight meaning in official script also plays an important role in the history of China calligraphy.
It is the first national title and annual money in China, and it is the first of its kind in later generations, such as "Da Liao Qing", "Da Yuan Zhi Zhi" and "Qing Xianfeng". Appraised by Mr. Luo Zhenyu, the value of this money has doubled, and there are many counterfeiters. The great Xia Nai really makes money, but there are only a few genuine ones. At present, most of the products circulating in the market are fakes, with a diameter of more than 2.3 cm, a weight of more than 3 grams, a heavy back, obvious sand casting traces, and even white copper fakes.
1946, 1989 A great summer revitalization was unearthed in Wuwei. Considering that Beiliang once regarded Daxia as the patriarch and used the name of Daxia, Erqian probably flowed into Hexi during Beiliang period.