The Observatory 20 Years Old Single Grain Scotch Whisky Signature Series is produced at the Mcduff distillery. The whiskey matures in bourbon casks for 20 years. This was created by the master blender Stephanie Macleod. Tasting notes:Color: Light amber. Nose: Fruity, sweet, notes of vanilla, caramel. Taste: Rich, fruity, notes of wood, citrus, oak. Finish: Long lasting.