for me if it all complete. 600-800. should have a sqare pan shade at the top. and with the base its need all sides and hole cover etc.
fully restored the seem to be around 2-3k depening on restoration , with globe etc.
there is one local to me in a field which ive put an offer off 400 on. mainly due to logistics.they are heavey and awkward to move, 3 blokes ideally and a van with capacity and all this is not free.
if it is local for you and easy to move and not so much cash then go for it.
id love to have it, dug one out saturday morning!
Doug