Wow! Your serial number puts the rifle in the 1893 timeframe! Your particular gun should be lacking the trigger plate support screw on the left side of the receiver. "Special Smokeless Steel" barrels did not exist, either. Marlinman93 would be a good source for approximate values. He and some other forum constituents frequent a lot of gun shows and have a better idea of what the market is. As for Winchesters, I dunno! Scarf up the Marlin if you can!