bond wrote:In the days of prohibition, it was apparently the favourite tipple of the then legendary bootlegger Mc Coy and hence, references to the "real" Mc Coy were probably references to Cutty Sark.
There are a few theories concerning this term. In the latest Malt Maniacs (#103), Konstantin Grigoriadis puts forth this theory, also dealing with Cutty Sark:
“Berry Bros, a highly respectable firm of London wine and whisky merchants then launched a new brand of Scotch, the first of the 'light' whiskies, exclusively for export, the Cutty Sark. For the booming Bahamas market, which was the back door into Prohibition America, Francis Berry saw advantages in working with Captain McCoy, whose reputation for dealing only with genuine goods had led to the idiom: 'It's the real McCoy'.”