唐代的开元通宝钱,铸行了近300年,虽说其制式基本不变,但各期不同的时代特征还是较为明显的,其中版别变异最大的有两次,第一次是安史之乱后,开元钱的文字由欧阳询书体转变为扁头通长“一”元式,并大量出现月纹。第二次为中兴末期的穆宗长庆元年到武宗会昌四年(约公元821-844年)的阔缘开元。 Kaiyuan Tong in the Tang Dynasty treasures, casting line for nearly 300 years, although its standard basically unchanged, but the different periods of the characteristics of the time is still more obvious, of which the largest version of variation twice, the first is the history of chaos, Kaiyuan money text by the Ouyang inquiry body into a flat head long “a ” meta-style, and a large number of monthly pattern. The second time was for the late Zongxing Muzong Changqing the first year of Wuzong Huichang four years (about 821-844 AD) broad margin of the New Century.