There were eight kinds of copper coins in the Tang Dynasty.
The coins of the Tang Dynasty include Kaiyuan Bao Tong, Ganfeng Quanbao, Gan Yuan Chongbao, Dali Yuanbao, Jianzhong Bao Tong, Huichang Kaiyuan, Deyi Yuanbao and Shuntian Yuanbao.
1, Kaiyuan Bao Tong: When Tang Gaozu Li Yuan was in Wude for four years, he changed the monetary system of previous dynasties and minted a coin named "Bao Tong" belonging to the Tang Dynasty, which was named "Kaiyuan Bao Tong".
2. Full coverage of Ganfeng: In the first year of Ganfeng (AD 666), it was introduced from Tang Gaozong. The diameter of the money is 2.5 cm, and the words on the money are official script, which is read in a rotating way, bare back, pure copper and well cast.
3. Gan Yuan Chongbao: In July of the first year of Gan Yuan, Tang Suzong ordered the promotion of casting line. The diameter of money is 2.7 cm and it weighs 5.97 grams. The words on the money are official script, which is easy to read and exquisite in calligraphy. Some have bare backs, some have rosefinch, and some wear auspicious clouds or stars.
4. Dali Yuanbao: A kind of currency that seems to have been minted in Tang Daizong over the years. There is no written record, but it exists in kind. The diameter of money is 2.3 cm, which is a small flat coin with no words on the back.
5. Jianzhong Bao Tong: The diameter of money is 2. 1 cm and the weight is1.8-2g. This is an official script of Qian Wen. It is read in turn, and there is no script on the back.
6. Huichang Kaiyuan: Li Shen took the lead in casting and presenting Kaiyuan coins with the word "Chang" on the back and the year number "Huichang".
7. Deyi Yuanbao: It was issued by Shi Siming in the late Xuanzong period of the Tang Dynasty, but it didn't last long, but it witnessed the history of the Tang Dynasty.
8. Shuntian Yuanbao: It was issued in An Lushan in the late Tang Xuanzong period. It was not long, but it witnessed the history of the Tang Dynasty.