Tang Dynasty. Qian Yuan Zhong Bao, 759 AD, AE 50 Cash (12.2 g, 34.4 mm). Doubled rim variety, issued in 759 (second year of Qian Yuan) as the second series of this coinage. Covered by brownish colors with reddish and rusty patina. Traces of tooling in the fields, light scratches on rims. A square fl