I asume that you are talking about a G29 or a 66o code G29/40? Is this one made to the same config. as a 98k or is it in the Austrian stock and fittings?

Id say that either in nice matching condition would bring around 1500 give or take a few hundred. Like everything else it depends on if you get near retail or sell to someone who is looking to just turn it over fast for some profit.