What are the weights of Kaiping, Bao Tong and Qian Wen?

Hou Liang once imitated Kaiyuan Bao Tong and cast Kaiping Bao Tong in Kaiping years. Kaiping is the title of Zhu Wen in the Five Dynasties. This kind of coin is very rare because of its small casting quantity and few handed down from generation to generation. Kaiping Bao Tong is modeled after Kaiyuan Qian, but it is rough casting and irregular outline. This coin, with a diameter of 3.5 cm, is a kind of official script in Qian Wen, with scrawled handwriting and blunt strokes. Casting and bronze are poor, and Qian Wen's calligraphy is also poor, almost unwritten.