With its unique grain selection, it cannot be categorized as a rye or a bourbon. After disappearing from the market in 1989, Michter’s Original Sour Mash Whiskey made a triumphant return in 2012 with its introduction into the US 1 line. Staying true to the profile and palette of its predecessor, Michter’s US 1 Sour Mash has quickly become a favorite of whiskey enthusiasts.