Yuan Dynasty. Zhi Yuan Tong Bao, 1285-1294, AE 2 Cash (5.9 g, 28.8 mm). Issued during the reign of Kublai Khan. Legend in Phags-pa script (Mongolian language). Even heavy dark brownish patina on both sides. Fine.Kublai Khan was the grandson of Genghis Khan. After the death of his brother Mengke Khan