Liao or Yuan Dynasty. Da Shu Tong Bao, undated, AE charm (90.4 g, 61.8 mm). Issued between 12th to 14th century. \Xing Bang Tong Xin\ on back, meaning \working together to rejuvenate the country\. Hint of rusty and greenish colors. Extremely Fine.A rare large format charm in the northern style, prob