Released September 2017, this bottling from Old Potrero takes their 18th Century Style Whiskey and finishes its maturation in former stout barrels. These stout barrels have matured other products. They started off aging straight rye whiskey in charred barrels. They then held apple brandy until that was matured. Next, they were put to use aging stout beer for a year. After the stout aging, Old Potrero aged their 18th Century Style Whiskey--aged in new, toasted American oak-- and placed them in these stout barrels for six months. This limited edition whiskey is bottled at 55.4% ABV and is exclusive to California.