Bảo Đại Thông Bảo
The Bảo Đại Thông Bảo (chữ Hán: 保大通寶; French: Sapèque Bao-Daï) was a round Copper-alloy coin with a square hole produced by the Nguyễn dynasty under French protection and was the last cash coin produced both in Vietnam and the world, this ended a long series of cast Vietnamese coinage that started with the Thái Bình Hưng Bảo in 970. The cast Bảo Đại Thông Bảo were produced at the Thanh Hóa Mint, while the machine-struck variants were produced in Hanoi by the colonial French government.