Looks good. Well, what kind of engine, tank, controls, how many flights, did a local guy help you trim it out, are you a regional Expert, all of those will factor into what it's worth.
National Champs models well trimmed with top finishes go go for a couple of thousand or up, 50 year old Noblers built from Top Flight kits with old sloppy controls never flown with unreliable bushed engines from the 50's are best sold to antique people on eBay!
Why don't you put it all together and fly it? Did you finish it to sell or what?
Chris...