23.8 mm, 2.45 gram
Bao Thai was the second reign title (1720-1729) of Emperor Le Du Tong, after the first reign title Vinh Thinh (1706-1719). As Vinh Thinh thong bao coin, Bao Thai thong bao were made of copper, some Bao Thai had the reverse side with the figure of the star and the moon.