When was Daguan Bao Tong made and what material was it made of?

Daguan Bao Tong is the annual money of Evonne, a famous painter and calligrapher in the Northern Song Dynasty. It is cast in bronze. Daguan Bao Tong is exquisitely cast, and small flat money is common. The ordinary version of 5 yuan is about 2,000 yuan, the market price is about 3,000 yuan, and the market price of Shimei products is about 1000 yuan. I hope it helps you.