Rollcage,
According to the 27th Edition of the Blue Book of Gun Values, a Winchester 1897 is worth:
100% - $850; 98% - 725; 95% - 575; 90% - 500; 80% - 450; 70% - 350; 60% - 250;
50% - 225; 40% - 195; 30% - 175; 20% - 150; 10% - 125
This will, of course, be affected by the laws of supply and demand.
Hope this helps.
Sincerely,
Prof. A. Wickwire