you can't compare the zuke to this, diff ball game, twice the price originally, only 200 hours per year ave etc.
without phoning and getting a deal, they are 10k new online so i would say you are looking at 5k tops with no history.
however, i wouldn't go near it if not regular oil changes...ymmv
edit- i assume this is it then-
http://www.boatsandoutboards.co.uk/O...ner-150/170695
says it has history so you would need to look into that.
i think the price is ball park though if history can be proved.