The grave was discovered at depth of more than five meters underground while a construction crew dug on the side of the Thanh Den Mountain to enlarge the Tan Phu Xuan Cement Factory.
The grave was made of ironwood pieces put together while the casket was a dugout tree trunk like those used in the Dong Son Civilization, museum officials said.
Nothing except a sedge mat was found in the casket. The excavation team found seven wooden trays and four statuettes, as well as dishes, bowls and combs made of wood. Clay utensils with simple beehive and line designs were also found.