When self-made Dutch millionaire Bay van der Bunt put his extensive cellar up for sale a couple of years ago, he shone a light on both the collectibility and the investability of rare liquors. His 5,000-bottle collection, said to be the world’s largest, included a cognac that had travelled with Napoleon’s army, and another from the Duke of Windsor’s Paris cellar. In all, it was valued at €6 million.
