Single Cask Nation Undisclosed Speyside 28 Year Old Single Malt Scotch WhiskyA 28 year old cask bottling from an undisclosed Diageo owned distillery, though we do know that it's located southwest of Aberlour. It was distilled in September 1989, and spent just over a quarter of a century maturing in a single refill Oloroso sherry butt. It was bottled by Single Cask Nation in December 2017 at cask strength, 54. 3% ABV, and was a limited release of 488 bottles. A very intriguing single malt.