Occupation cast coinage, The Lord, Nguyen Phuc Khoat (1738-1765) 'Thien Minh Thong Bao', rev,: some with right side dot. zinc. According to the book of Phu Bien Tap Luc 'Miscellanous records in the border area' by Le Quy Don (1776) recited: 'There was one kind of coin called Thien Minh Thong Bao, which had black lead mixed in and became very fragile. people refused to accept it because of its ugliness; therefore the trade did not go smoothly, coins were not circulated well'.