In the UK, “100 proof” signifies a spirit with 57.15% alcohol by volume, often rounded to 57.1% ABV. It also names an extensive, affordable series by independent bottler Signatory Vintage, with over 30 releases filled at 57.1% ABV (some of them being ‘Exceptional Casks‘). We are examining three early releases in this series: the Glentauchers, Glenrothes, and Caol Ila 100 Proof Signatory Vintage, specifically numbers 6, 8, and 10.
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