明朝裕民通宝背壹钱,37.1x2.4mm 17.8g,华夏78,尚·皮尔·米歇尔中国钱币系列,Ming Dynasty, Yu Min Tong Bao, Yi Qian on the reverse, struck by Geng Jingzhong as a rebel during the end of the Ming Dynasty, he went on to became one of the famous Three Feudatories in the early Qing era, weighs 17.8 grams, graded Huaxia 78