元代至正通宝一组3枚，包括小平背辰，折二背辰及折三背辰，分别评中乾80，82及80，折三带明顥绿銹，至正通宝由元朝末年的第20代蒙古大汗妥坤帖木儿於公元 1333-1370 年（北元 1368-70 年）在同名时期发行。China: Yuan Dynasty, Zhi Zheng Tong Bao, (1271-1368), lot of 3 coins, 1 cash, 25x1.1mm, 3.0g; 2 cash, 29.2x1.9mm, 7.1g and 3 cash, 34.4x2.8mm, 9.6g, all 3 coins rev: Chen in Phags-pa script, Zhong Qian 80, 82 and 80 respectively, lovely light green patina, especially on the 3 cash coin. Zhi Zheng Tong Bao was issued during the era of the same name (1341-1370) by Toghon Temur, r.1333-1370 (1368-70 as Northern Yuan) in the waning years of the Yuan Dynasty. . (3). [150-152]
