INTERNATIONAL - Another day, another million-dollar bottle of whisky.

Less than 24 hours after a 60-year-old Macallan sold for 848,800 pounds ($1.1 million) on Oct. 4 at Bonhams in Edinburgh, auction-house rival Christie’s unveiled a single malt from the same vintage which could crack the one million pound mark in November.

Meanwhile, Sotheby’s is putting its own bottle from that cask, filled in 1926, on the block in New York on Oct. 12 with a high estimate of $1.2 million. When it rains, it pours.

The 194-year-old Macallan distillery, on the banks of the River Spey, calls this vintage the "holy grail" of whiskies, bottled in 1986 after six decades in an oak cask. Only about 40 bottles were made, and none have appeared at auction in more than a decade. But when two sold for more than $1 million each at Bonhams, the market woke up.

"Before that first bottle was auctioned, nobody really knew how much it was worth," said Aaron Chan, a Hong Kong based collector who runs Club Qing whisky bar. "Suddenly people thought, ‘Oh my God, it’s worth so much,’ and owners realized it’s a good time to sell."

The Bonhams sale in Edinburgh set a world record in pounds, but in dollar terms the most expensive was in Hong Kong in May, when a bottle of the 1926 Macallan with a label designed by Italian painter Valerio Adami sold for HK$8,636,250 ($1,101,300). That works out to about $40,000 per shot.

A luxury Swiss hotel said last August it would carry out tests on one of its rare bottles of whisky amid claims it was a fake after Zhang Wei paid £7 900 (R146 717) for just one shot.
Spirited Gains

Prices for whiskies have soared in recent years as investors and lovers of the beverage seek out rare single malts from Scotland, such as Dalmore and Port Ellen, as well as bottles from Japanese distilleries Karuizawa and Yamazaki. As an alternative investment, the amber-colored spirit has appreciated 140 percent in the past five years, according to the Vintage 50 Index compiled by Rare Whisky 101, far outpacing the 19 percent advance of the Liv-ex 100 Benchmark Fine Wine Index.

Whisky has the added advantage of a long shelf life, while top Bordeaux and Burgundies are generally best consumed with a few decades of bottling.

A wine’s vintage is determined by the year in which the grapes were picked, and bottling usually takes place within 16 to 24 months of the harvest. For whisky, the age refers to the time spent in the cask. So the Macallan 1926 bottled in 1986 is a 60 year old. That’s a long time spent aging, and because of loss due to evaporation, known as the "angel’s share," only a small fraction of whisky was left in the cask to bottle.