The coins, which are made of copper and tin, were discovered underwater by three local fishermen while diving for snails and shells. The divers immediately brought the coins onto their boat to return home. The coins were temporarily handed over to the Roon Border Guard Station.
The coins have initially been defined to date back to the Nguyen Dynasty in the 19th century
According to the provincial Department of Culture, Sports and Tourism, the coins were used during the reigns of Gia Long (1802-1820) and Minh Mang (1820-1840) under the Nguyen Dynasty.
Most of the coins have corroded; while some have remained quite intact with historical and cultural value.
Experts from the Quang Binh Department of Culture, Sports and Tourism and Quang Binh Museum have analysed a kilo of the coins, while the remainder are still being kept at the Roon Border Guard Station.