The rich amber-brown of the Macallan M single-malt whisky—a special iteration of the Macallan contained in a hand-blown 750 mL Lalique crystal decanter—is noticeably deeper and darker than even the Scotch maker’s iconic 25-year-old whisky. Yet there is no age statement on this bottle, for the spirit is composed of whisky from seven casks selected by the Macallan’s master whisky maker, Bob Dalgarno, after more than two years of searching through the Macallan’s vast cellars of over 195,000 barrels. The oldest wh…