What is a coin with a weight of yuan?

Fu Yuan Chong Bao and Yuan De Chong Bao,

Fu Yuan Chongbo was born in Song Zhezong in the Northern Song Dynasty. During the reign of Fu Yuan (1098- 1 100), he was cast, face-to-face, spin-read, bare-backed, two-fold, iron mother, orphan.

Yuan De Chongbao, Xixia and Chongzong Zhao Ganshun119-1126 were cast in Yuan De, which is extremely rare from generation to generation and is the treasure of Xixia money.