For the 2017 release, The Balvenie Tun 1509 Batch 4, David C Stewart MBE carefully selected 23 casks – 13 traditional American oak barrels and 10 European oak sherry butts – from the distillery’s precious aged stocks. All were transferred to Tun 1509, which sits in Warehouse 24, for several months before bottling. Tun is a rare interpretation of the marrying process and allows our most mature casks of various vintages to come together to create a unique expression of The Balvenie that is greater than the sum of its constituent parts.