明朝大明通宝背户, 重量3.3g, 华夏75,尚·皮尔·米歇尔中国钱币系列,Ming Dynasty, Da Ming Tong Bao, the character Lu on reverse, struck during the Southern Ming Dynasty by the Price of Lu, Zhu Yi Hai when he became the Regent of the quickly diminishing Ming Empire, weighs 3.3 grams, Huaxia 75, scarce