That copper coin font is fine gold.

Northern Song Dynasty: Evonne's and Hui Zong's regular script calligraphy are original and integrated, and they are called hand-drawn calligraphy. Bao Tong in Chongning has ten, Xiao Ping has two, Bao Tong in Daguan has ten, five, three, two and Xiao Ping has five, and Bao Tong in Xuanhe once visited Shaanxi, all of which are thin gold bodies.

Jin Dynasty: Imitation of thin gold body: Dading Bao Tong, Taihe Bao Tong Xiaoping, folding two, folding three, folding five, folding ten, Chongqing Bao Tong Xiaoping, folding two.

Southern Song Dynasty: Jianbao and Beichuan were built in Southern Song Dynasty. Shaoxing gold ingots also have thin gold bodies.

Qing Dynasty: Xianfeng, Bao Tong, Baohe and Xiaoping (imitation).