One of the great joys of wine auctions is the chance for wine lovers to stumble upon bottles that are otherwise impossible to find. In most regions, winemakers bottle almost their entire harvest in standard 750ml formats. A small share may be set aside for magnums, already a rarity in itself. As for the even more generous formats, special requests excluded, they are produced by only a handful of estates. Champagne, Bordeaux, and the Rhône Valley are the main producers of these coveted giants...