This is a hard pottery jar with a stamp from the Spring and Autumn Warring States period of ancient China (BC770-221). It has a vase shape with a low center of gravity and has a cloth pattern that covers the entire vessel.
The fraying around the mouth is also good, and it looks like a flower. It was baked tightly and there was no water leakage when it was filled with water for about an hour.
Comes with wooden box.