The lamp is from the 1930s. I love finding interesting vases mounted on early 20th century lamps because you don't have to deal with all the elaborate fakes of today. I know we can't say for sure without seeing the bottom but from these photos, could it be from the kangxi period?
Shape, painting style and colors looks indeed as if it could be late Kangxi.
Thanks peter, I'll buy it and try to remove it from the mount. I'll update my findings here.