V2520, Annam Thanh-Thai Thong-Bao (Cheng-Tai Tong-Bao), AD 1889-1907.
Bronze, VF condition, please refer the picture.
The name of the coin is "Thanh-Thai Thong-Bao" in Vietnamese, or "Tong-Qing Tong-Bao" in Chinese language.
Annam Nguyen Dynasty, Minted by Emperor Nguyen Thang-Thai during AD 1889-1907.
The catalogue No 107.0 (Dr. R. Allan Barker's "The Historical Cash Coins of Viet Nam").
Diameter: 22 to 24 mm.
Weight: around 3.0 gram.