元代至正通宝一组3枚，包括小平背卯，折二背卯及折三背卯，均评中乾82，折三带明显绿銹，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 Dynsaty, Zhi Zheng Tong Bao, (1271-1368), lot of 3 coins, 1 cash, 25.1x1.2mm, 3.5g; 2 cash, 29.5x1.6mm, 6.0g and 3 cash, 34.2x2.4mm, 10.0g, all 3 coins rev: Mao in Phags-pa script, all 3 coins graded Zhong Qian 82, 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). [147-149]
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