同慶帝
Under French administration the Nguyễn government issued the Kiến Phúc Thông Bảo (建福通寶), Hàm Nghi Thông Bảo (咸宜通寶), Đồng Khánh Thông Bảo (同慶通寶), Thành Thái Thông Bảo (成泰通寶), Duy Tân Thông Bảo (維新通寶) cash coins of different metal compositions and weights. Each of these cash coins had their own value against the French Indochinese piastre. Because the exchange values between the native cash coins and silver piasters were confusing, the local Vietnamese people were often cheated by the money changers during this period.