Four Chinese characters - Chieu Thong Thong Bao / Chinh below hole. 25mm, 4.00 grams. Issued 1787-1789.  Krause KM 118; Vietnamese Coins (National Museum of Vietnamese History, 2005) #224.

Chiêu Thống (1786–1789) was the last emperor of the Later Lê dynasty of Vietnam. His reign was marked by political turmoil and the growing power of the Tây Sơn dynasty, which had effectively displaced the Lê rulers. Seeking to regain his throne, he appealed to Qing China for military assistance, prompting a Chinese invasion in 1788. The Qing forces were decisively defeated by Nguyễn Huệ (Emperor Quang Trung) in 1789, forcing Chiêu Thống to flee to China, where he died in exile in 1793.