Insider knowledge: Bunnahabhain 13 Year Old 1997 Heavily Peated - Cask Strength Collection (Signatory) whisky is named whisky by virtue of the fact it's from Scotland. If distilled in America the spelling would be Bunnahabhain 13 Year Old 1997 Heavily Peated - Cask Strength Collection (Signatory) whiskey, as opposed to whisky.