The drawback to using Gun Broker final sale prices as an accurate guide to what something is worth, is that it is an auction, and the final price can be inflated over the actual value of an item due to the "frenzy of bidding wars" and the bidder's willingness to pay more in order to "get it now".
Winchester essentially suspended production of civilian rifles during the "mid-1940s. (WWII years 42-45) and resumed after the war (46 on). This does not mean there were zero civilian rifles made during those years, only that there were very, very few.
A gun shop or gun show dealer won't give you full value if you are selling the gun, but some will give you an honest appraisal if you're not trying to sell it, to them.
Along with the physical condition, one of the factors affecting the price of old Winchesters is the "collector value". Exact date (year) of manufacture, specific model, and features, amount made, and "desirability" to collectors influences what they will pay.
Good, clear pictures go a LONG way. also being able to see all the markings on the rifle, help a lot.
I don't closely follow the market for old Winchesters, but considering how much everything costs today, $800 for a good one probably isn't too much.
Half a century ago, it would have been a $200 or possibly a $300 used rifle. Those days are far behind us now...