I'd suggest going to gunsinternational.com and comparing Francotte pricing. Doubt you'll find one like yours, but you should find quite a few 14's. Look for 12's only. The smaller gauges command higher prices. Then deduct maybe 15-20% from the average price (because these are dealer prices for the most part, vs private sellers). Should give you a ballpark figure.
As far as where to sell it: I'd suggest posting it right here on doublegunshop. Nice looking gun, and you have decent photos. Should attract some interest. And people here, for the most part, aren't put off by the Damascus barrels. Matter of fact, that would be a plus for some folks here. Good luck.
