Gan Long Bao Tong was cast during the reign of Emperor Gaozong in the Qing Dynasty (1736- 1795), and the Manchu script on the back was complicated. You can refer to Hua Guangpu's Catalogue of Ancient Chinese Coins, which contains detailed prices and coin rubbings. The historical period was the reign of Emperor Gaozong in Qing Dynasty (1736 ~ 1795). Most of them are small flat coins, and some Xinjiang red coins are used as ten coins. Baoquan and Bao Gong found that there was a lot of money, but they should spend it on furnace opening or late casting, not on materials.
Appraisal method of extended data: All titles in Qing Dynasty were minted with coins, and Qian Wen was generally written in Manchu and Chinese. There are Bao Tong Shunzhi, Bao Tong Kangxi, Bao Tong Yongzheng, Bao Tong Qianlong, Bao Tong Jiaqing and Bao Tong Daoguang. Identification is mainly grasped from three aspects. One is to determine the age of ancient coins, the other is to determine the authenticity of ancient coins, and the third is to determine the preciousness of ancient coins.
The dating of ancient coins is generally not a problem in coins with year numbers, but it is more complicated in the dating of some coins without year numbers and winning coins, and the age must be determined according to their texture and shape characteristics.
Because coins in past dynasties have a high collection value, counterfeit coins have appeared in various historical periods, and it is difficult to identify the authenticity. To identify the authenticity, we must start with the shape, texture, patina, characters and manufacturing technology of coins. The coins of each period have their own unique styles and characteristics in shape, texture and writing. The casting process in different historical periods is not the same, so counterfeiters can't fully grasp it.
Refer to Baidu Encyclopedia-Gan Long Bao Tong