Nguyễn Nhạc
Under Nguyễn Nhạc the description of "Thất Phân" () was first added to the reverses of some coins indicating their weight, this continued under the Nguyễn dynasty. Under the reign of Nguyễn Huệ Quang Trung Thông Bảo (光中通寶) cash coins were produced made in two different types of metal, one series of copper and one series of tin, as well as alloys between the two or copper coins of red copper.