glass lamp with chimney

I just received this table lamp from my late Grandmothers estate and know nothing of the age, maker, etc. She was into antiques so I assume it's an antique but not for sure.
It has a base that "looks" like an oil lamp, but whether it was converted or not I do not know either. The base is also a slight greenish tint, not perfectly clear.
There is a chimney which is partly opaque, partly clear.
It stands 21" tall.
Does anybody have any idea who made this or when??