Parker repros are still selling quite high, 23 are almost the exact same gun. A little different styling but the same Japanese puttin' them together, the best way to sell something like that is to let RIA or gunbroker.com do the research for you, list the set on gunbroker, set a reserve that is high (15K) and let the bidding begin, RIA will appraise and get the most they can for you and the gun can still be reserved. Kind of a specialized market on a set like that, takes a serious winchester collector, as most would not want to shoot a set like this. Those that won't mind shooting a set, will probably have enough in the checking account to pay top dollar, with the stock market down, expensive hard goods (coins, gold guns etc.) have been selling well. IMHO the value would be in the 12-15K range as single guns in the small bore bring 2500-3000 most of the time.
