What is special about the 2,000-year-old national treasure at the billion-dollar museum in Yen Bai?

The jar is about 2,000 - 2,500 years old, 47.4 cm high, weighs 13.5 kg, was cast in a two-piece mold and has a rusty green color. The results of spectral analysis at the Institute of Geology of the National Center for Natural Sciences and Technology show the following ratios: Copper: 64.92%; Lead: 0.9%; Tin: 0.72%; Cadmium: 0.1%; Aluminum: 0.02%; Silicon: 0.017%. The results show that Copper, Lead, Tin is a typical alloy of the Dong Son culture in the Yen Bai mountainous region.