Anti-Ming War, Tran dynasty, Emperor Tran Cao (1426-28 AD), Thien Khanh era (1426-27 AD), 'Thien Khanh Thong Bao' large type. 4.2g, Bronze, 24.92mm. Thien Khanh coin was cast during the time when ancient Vietnam was controlled by China Ming Dynasty (Xuande era, as shown in previous coin), and anti-Ming Le Loi for puppet king Hi Ong for tribute to Ming, Scarce.