If you do a bit of looking here,, in our own classifieds,, you can find the occasional listing and sale of similar guns. In fact,, there's a similar gun FS on page 2 of the classifieds right now,, listed at $750 and has not been sold. So a value of $800-$900 is a fair amount higher than realistic prices. Maybe for insurance purposes,, but not realistic sales prices.
You can list it here in our Classifieds,, with a starting price and add OBO,, to see what happens. If you are selling locally,, then you can kinda get an idea of values from GB & here etc,, and if a potential buyer wants to haggle,, then price accordingly.
As noted,, that particular model was made in a large quantity,, so it's not as rare or as scarce as others.