Frankly, not much. The fact that no one has answered this for 7 months should tell you something. With the liquid in it, the bottle could be worth quite a bit, but when it is empty, it is just a hunk of glass. The labels might be worth something to a collector, or if it is really old, you might get something from a designer for a restaurant, but that would be kind of a lucky beak. And collectors are more likely to want full bottles rather than labels. I make sparkling wine, and usually get used champagne bottles from friends, restaurants and other places for free, regardless of how valuable the liquid was that they once contained..