Dr. James Crow's Old Crow. Since 1835. The original sour mash. 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).