About 22kg of Vietnamese and Chinese ancient metal coins, some dated back to the 11th century, were found buried in a garden in Ha Tinh Province.
The garden's owner, Dang Van Sinh, said he saw some strangers, who may be thieves, digging in the garden late on Oct. 4.
The busted thieves ran away, leaving the coins, which were kept in five terra-cotta jars, one of which was broken. The vases had been buried two meters underground, Sinh said.
Sinh called the Ha Tinh Museum, who sent experts to Sinh's to collect the coins on Thursday.
Le Ba Hanh, the museum's vice director, said Friday that the Vietnamese coins were issued during the Le Dynasty between 1740 and 1786, while some Chinese coins may date back to 1085.
The round-shaped coins with a square hole in the center were almost intact. The Vietnamese coins are bigger and heavier.
A Le dynasty-era pottery bowl wearing Chinese characters was among the coins.
Ha Tinh Museum officials are asking for a permit to excavate the area for further insights into its history.