The original sour mash. Since 1835. James Crow. Division of the Old Crow Distillery Company Frankfort, Clermont. When Dr. James Crow invented the sour mash process in 1835, he revolutionized Kentucky bourbon making. Old Crow soon became the world's best selling bourbon. Through the years, Old Crow has often been imitated but never duplicated. Enjoy the true original! Aged for a full 3 years in new charred white oak barrels. 40% alc/vol (80 proof). Distilled and Bottled by WA Gaines Division of the Old Crow Distillery Company Clermont. Frankfort, Kentucky USA.