Purchased from Noori's Collection in Aspen, CO a few years ago where they provided an appraisal that stated it was from the Han Dynasty time period and valued at approx. $3000-5000. About 14 inches tall and 7 inches in diameter at the thickest point and 5in at the base. No major chipping or any cracks.
Purchased from Noori's Collection in Aspen, CO a few years ago where they stated that it was purchased while on a buying trip to Afghanistan, Mongolia, Tibet and eastern China in the 1970s or 1980s.
I think your vase is not from the Han dynasty but a later copy. Colors and the old age characteristics are not what I would like to see. Having said that; it is very hard to evaluate this type of unglazed wares from picture. If you want to be sure I would recommend a TL test. Not cheap but if your pot is an original one it wil add to the value and the test is paid.. Nevertheless if I had this pot in my possession I think I would not spend that money. I will make this evaluation Conditional since I can never be 100 % sure. Conditions were the pot was buried / stored can make a difference in what you see. My valuation for now it a for a decorative Han dynasty look a like pot.